| /* |
| * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2012, 2019 SAP SE. 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 "jvm.h" |
| #include "asm/assembler.inline.hpp" |
| #include "classfile/classLoader.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "classfile/vmSymbols.hpp" |
| #include "code/codeCache.hpp" |
| #include "code/icBuffer.hpp" |
| #include "code/vtableStubs.hpp" |
| #include "interpreter/interpreter.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "nativeInst_ppc.hpp" |
| #include "os_share_linux.hpp" |
| #include "prims/jniFastGetField.hpp" |
| #include "prims/jvm_misc.hpp" |
| #include "runtime/arguments.hpp" |
| #include "runtime/extendedPC.hpp" |
| #include "runtime/frame.inline.hpp" |
| #include "runtime/interfaceSupport.inline.hpp" |
| #include "runtime/java.hpp" |
| #include "runtime/javaCalls.hpp" |
| #include "runtime/mutexLocker.hpp" |
| #include "runtime/osThread.hpp" |
| #include "runtime/safepointMechanism.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "runtime/stubRoutines.hpp" |
| #include "runtime/thread.inline.hpp" |
| #include "runtime/timer.hpp" |
| #include "utilities/debug.hpp" |
| #include "utilities/events.hpp" |
| #include "utilities/vmError.hpp" |
| |
| // put OS-includes here |
| # include <sys/types.h> |
| # include <sys/mman.h> |
| # include <pthread.h> |
| # include <signal.h> |
| # include <errno.h> |
| # include <dlfcn.h> |
| # include <stdlib.h> |
| # include <stdio.h> |
| # include <unistd.h> |
| # include <sys/resource.h> |
| # include <pthread.h> |
| # include <sys/stat.h> |
| # include <sys/time.h> |
| # include <sys/utsname.h> |
| # include <sys/socket.h> |
| # include <sys/wait.h> |
| # include <pwd.h> |
| # include <poll.h> |
| # include <ucontext.h> |
| |
| |
| address os::current_stack_pointer() { |
| intptr_t* csp; |
| |
| // inline assembly `mr regno(csp), R1_SP': |
| __asm__ __volatile__ ("mr %0, 1":"=r"(csp):); |
| |
| return (address) csp; |
| } |
| |
| 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). |
| |
| return (char*) -1; |
| } |
| |
| // Frame information (pc, sp, fp) retrieved via ucontext |
| // always looks like a C-frame according to the frame |
| // conventions in frame_ppc64.hpp. |
| address os::Linux::ucontext_get_pc(const ucontext_t * uc) { |
| // On powerpc64, ucontext_t is not selfcontained but contains |
| // a pointer to an optional substructure (mcontext_t.regs) containing the volatile |
| // registers - NIP, among others. |
| // This substructure may or may not be there depending where uc came from: |
| // - if uc was handed over as the argument to a sigaction handler, a pointer to the |
| // substructure was provided by the kernel when calling the signal handler, and |
| // regs->nip can be accessed. |
| // - if uc was filled by getcontext(), it is undefined - getcontext() does not fill |
| // it because the volatile registers are not needed to make setcontext() work. |
| // Hopefully it was zero'd out beforehand. |
| guarantee(uc->uc_mcontext.regs != NULL, "only use ucontext_get_pc in sigaction context"); |
| return (address)uc->uc_mcontext.regs->nip; |
| } |
| |
| // modify PC in ucontext. |
| // Note: Only use this for an ucontext handed down to a signal handler. See comment |
| // in ucontext_get_pc. |
| void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) { |
| guarantee(uc->uc_mcontext.regs != NULL, "only use ucontext_set_pc in sigaction context"); |
| uc->uc_mcontext.regs->nip = (unsigned long)pc; |
| } |
| |
| static address ucontext_get_lr(const ucontext_t * uc) { |
| return (address)uc->uc_mcontext.regs->link; |
| } |
| |
| intptr_t* os::Linux::ucontext_get_sp(const ucontext_t * uc) { |
| return (intptr_t*)uc->uc_mcontext.regs->gpr[1/*REG_SP*/]; |
| } |
| |
| intptr_t* os::Linux::ucontext_get_fp(const ucontext_t * uc) { |
| return NULL; |
| } |
| |
| static unsigned long ucontext_get_trap(const ucontext_t * uc) { |
| return uc->uc_mcontext.regs->trap; |
| } |
| |
| ExtendedPC os::fetch_frame_from_context(const void* ucVoid, |
| intptr_t** ret_sp, intptr_t** ret_fp) { |
| |
| ExtendedPC epc; |
| const ucontext_t* uc = (const ucontext_t*)ucVoid; |
| |
| 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 = os::Linux::ucontext_get_fp(uc); |
| } 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(const void* ucVoid) { |
| intptr_t* sp; |
| intptr_t* fp; |
| ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); |
| return frame(sp, epc.pc()); |
| } |
| |
| bool os::Linux::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) { |
| address pc = (address) os::Linux::ucontext_get_pc(uc); |
| if (Interpreter::contains(pc)) { |
| // Interpreter performs stack banging after the fixed frame header has |
| // been generated while the compilers perform it before. To maintain |
| // semantic consistency between interpreted and compiled frames, the |
| // method returns the Java sender of the current frame. |
| *fr = os::fetch_frame_from_context(uc); |
| if (!fr->is_first_java_frame()) { |
| assert(fr->safe_for_sender(thread), "Safety check"); |
| *fr = fr->java_sender(); |
| } |
| } else { |
| // More complex code with compiled code. |
| assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); |
| CodeBlob* cb = CodeCache::find_blob(pc); |
| if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { |
| // Not sure where the pc points to, fallback to default |
| // stack overflow handling. In compiled code, we bang before |
| // the frame is complete. |
| return false; |
| } else { |
| intptr_t* sp = os::Linux::ucontext_get_sp(uc); |
| address lr = ucontext_get_lr(uc); |
| *fr = frame(sp, lr); |
| if (!fr->is_java_frame()) { |
| assert(fr->safe_for_sender(thread), "Safety check"); |
| assert(!fr->is_first_frame(), "Safety check"); |
| *fr = fr->java_sender(); |
| } |
| } |
| } |
| assert(fr->is_java_frame(), "Safety check"); |
| return true; |
| } |
| |
| frame os::get_sender_for_C_frame(frame* fr) { |
| if (*fr->sp() == 0) { |
| // fr is the last C frame |
| return frame(NULL, NULL); |
| } |
| return frame(fr->sender_sp(), fr->sender_pc()); |
| } |
| |
| |
| frame os::current_frame() { |
| intptr_t* csp = (intptr_t*) *((intptr_t*) os::current_stack_pointer()); |
| // hack. |
| frame topframe(csp, (address)0x8); |
| // Return sender of sender of current topframe which hopefully |
| // both have pc != NULL. |
| frame tmp = os::get_sender_for_C_frame(&topframe); |
| return os::get_sender_for_C_frame(&tmp); |
| } |
| |
| // Utility functions |
| |
| extern "C" JNIEXPORT int |
| JVM_handle_linux_signal(int sig, |
| siginfo_t* info, |
| void* ucVoid, |
| int abort_if_unrecognized) { |
| ucontext_t* uc = (ucontext_t*) ucVoid; |
| |
| Thread* t = Thread::current_or_null_safe(); |
| |
| 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) { |
| if (os::Linux::chained_handler(sig, info, ucVoid)) { |
| return true; |
| } else { |
| // Ignoring SIGPIPE - see bugs 4229104 |
| return true; |
| } |
| } |
| |
| // Make the signal handler transaction-aware by checking the existence of a |
| // second (transactional) context with MSR TS bits active. If the signal is |
| // caught during a transaction, then just return to the HTM abort handler. |
| // Please refer to Linux kernel document powerpc/transactional_memory.txt, |
| // section "Signals". |
| if (uc && uc->uc_link) { |
| ucontext_t* second_uc = uc->uc_link; |
| |
| // MSR TS bits are 29 and 30 (Power ISA, v2.07B, Book III-S, pp. 857-858, |
| // 3.2.1 "Machine State Register"), however note that ISA notation for bit |
| // numbering is MSB 0, so for normal bit numbering (LSB 0) they come to be |
| // bits 33 and 34. It's not related to endianness, just a notation matter. |
| if (second_uc->uc_mcontext.regs->msr & 0x600000000) { |
| if (TraceTraps) { |
| tty->print_cr("caught signal in transaction, " |
| "ignoring to jump to abort handler"); |
| } |
| // Return control to the HTM abort handler. |
| return true; |
| } |
| } |
| |
| #ifdef CAN_SHOW_REGISTERS_ON_ASSERT |
| if ((sig == SIGSEGV || sig == SIGBUS) && info != NULL && info->si_addr == g_assert_poison) { |
| if (handle_assert_poison_fault(ucVoid, info->si_addr)) { |
| return 1; |
| } |
| } |
| #endif |
| |
| 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; |
| } |
| } |
| } |
| |
| // Moved SafeFetch32 handling outside thread!=NULL conditional block to make |
| // it work if no associated JavaThread object exists. |
| if (uc) { |
| address const pc = os::Linux::ucontext_get_pc(uc); |
| if (pc && StubRoutines::is_safefetch_fault(pc)) { |
| os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); |
| return true; |
| } |
| } |
| |
| // decide if this trap can be handled by a stub |
| address stub = NULL; |
| address pc = NULL; |
| |
| if (info != NULL && uc != NULL && thread != NULL) { |
| pc = (address) os::Linux::ucontext_get_pc(uc); |
| |
| // Handle ALL stack overflow variations here |
| if (sig == SIGSEGV) { |
| // si_addr may not be valid due to a bug in the linux-ppc64 kernel (see |
| // comment below). Use get_stack_bang_address instead of si_addr. |
| // If SIGSEGV is caused due to a branch to an invalid address an |
| // "Instruction Storage Interrupt" is generated and 'pc' (NIP) already |
| // contains the invalid address. Otherwise, the SIGSEGV is caused due to |
| // load/store instruction trying to load/store from/to an invalid address |
| // and causing a "Data Storage Interrupt", so we inspect the intruction |
| // in order to extract the faulty data addresss. |
| address addr; |
| if ((ucontext_get_trap(uc) & 0x0F00 /* no IRQ reply bits */) == 0x0400) { |
| // Instruction Storage Interrupt (ISI) |
| addr = pc; |
| } else { |
| // Data Storage Interrupt (DSI), i.e. 0x0300: extract faulty data address |
| addr = ((NativeInstruction*)pc)->get_stack_bang_address(uc); |
| } |
| |
| // Check if fault address is within thread stack. |
| if (thread->on_local_stack(addr)) { |
| // stack overflow |
| if (thread->in_stack_yellow_reserved_zone(addr)) { |
| if (thread->thread_state() == _thread_in_Java) { |
| if (thread->in_stack_reserved_zone(addr)) { |
| frame fr; |
| if (os::Linux::get_frame_at_stack_banging_point(thread, uc, &fr)) { |
| assert(fr.is_java_frame(), "Must be a Javac frame"); |
| frame activation = |
| SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); |
| if (activation.sp() != NULL) { |
| thread->disable_stack_reserved_zone(); |
| if (activation.is_interpreted_frame()) { |
| thread->set_reserved_stack_activation((address)activation.fp()); |
| } else { |
| thread->set_reserved_stack_activation((address)activation.unextended_sp()); |
| } |
| return 1; |
| } |
| } |
| } |
| // Throw a stack overflow exception. |
| // Guard pages will be reenabled while unwinding the stack. |
| thread->disable_stack_yellow_reserved_zone(); |
| 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. |
| thread->disable_stack_yellow_reserved_zone(); |
| return 1; |
| } |
| } 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 1; |
| } |
| thread->osthread()->clear_expanding_stack(); |
| } else { |
| fatal("recursive segv. expanding stack."); |
| } |
| } |
| } |
| } |
| |
| if (thread->thread_state() == _thread_in_Java) { |
| // Java thread running in Java code => find exception handler if any |
| // a fault inside compiled code, the interpreter, or a stub |
| |
| // A VM-related SIGILL may only occur if we are not in the zero page. |
| // On AIX, we get a SIGILL if we jump to 0x0 or to somewhere else |
| // in the zero page, because it is filled with 0x0. We ignore |
| // explicit SIGILLs in the zero page. |
| if (sig == SIGILL && (pc < (address) 0x200)) { |
| if (TraceTraps) { |
| tty->print_raw_cr("SIGILL happened inside zero page."); |
| } |
| goto report_and_die; |
| } |
| |
| CodeBlob *cb = NULL; |
| // Handle signal from NativeJump::patch_verified_entry(). |
| if (( TrapBasedNotEntrantChecks && sig == SIGTRAP && nativeInstruction_at(pc)->is_sigtrap_zombie_not_entrant()) || |
| (!TrapBasedNotEntrantChecks && sig == SIGILL && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant())) { |
| if (TraceTraps) { |
| tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL"); |
| } |
| stub = SharedRuntime::get_handle_wrong_method_stub(); |
| } |
| |
| else if (sig == ((SafepointMechanism::uses_thread_local_poll() && USE_POLL_BIT_ONLY) ? SIGTRAP : SIGSEGV) && |
| // A linux-ppc64 kernel before 2.6.6 doesn't set si_addr on some segfaults |
| // in 64bit mode (cf. http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.6), |
| // especially when we try to read from the safepoint polling page. So the check |
| // (address)info->si_addr == os::get_standard_polling_page() |
| // doesn't work for us. We use: |
| ((NativeInstruction*)pc)->is_safepoint_poll() && |
| CodeCache::contains((void*) pc) && |
| ((cb = CodeCache::find_blob(pc)) != NULL) && |
| cb->is_compiled()) { |
| if (TraceTraps) { |
| tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (%s)", p2i(pc), |
| (SafepointMechanism::uses_thread_local_poll() && USE_POLL_BIT_ONLY) ? "SIGTRAP" : "SIGSEGV"); |
| } |
| stub = SharedRuntime::get_poll_stub(pc); |
| } |
| |
| // SIGTRAP-based ic miss check in compiled code. |
| else if (sig == SIGTRAP && TrapBasedICMissChecks && |
| nativeInstruction_at(pc)->is_sigtrap_ic_miss_check()) { |
| if (TraceTraps) { |
| tty->print_cr("trap: ic_miss_check at " INTPTR_FORMAT " (SIGTRAP)", p2i(pc)); |
| } |
| stub = SharedRuntime::get_ic_miss_stub(); |
| } |
| |
| // SIGTRAP-based implicit null check in compiled code. |
| else if (sig == SIGTRAP && TrapBasedNullChecks && |
| nativeInstruction_at(pc)->is_sigtrap_null_check()) { |
| if (TraceTraps) { |
| tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGTRAP)", p2i(pc)); |
| } |
| stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); |
| } |
| |
| // SIGSEGV-based implicit null check in compiled code. |
| else if (sig == SIGSEGV && ImplicitNullChecks && |
| CodeCache::contains((void*) pc) && |
| !MacroAssembler::needs_explicit_null_check((intptr_t) info->si_addr)) { |
| if (TraceTraps) { |
| tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc)); |
| } |
| stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); |
| } |
| |
| #ifdef COMPILER2 |
| // SIGTRAP-based implicit range check in compiled code. |
| else if (sig == SIGTRAP && TrapBasedRangeChecks && |
| nativeInstruction_at(pc)->is_sigtrap_range_check()) { |
| if (TraceTraps) { |
| tty->print_cr("trap: range_check at " INTPTR_FORMAT " (SIGTRAP)", p2i(pc)); |
| } |
| stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); |
| } |
| #endif |
| else if (sig == SIGBUS) { |
| // 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); |
| CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL; |
| if (nm != NULL && nm->has_unsafe_access()) { |
| address next_pc = pc + 4; |
| next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc); |
| os::Linux::ucontext_set_pc(uc, next_pc); |
| return true; |
| } |
| } |
| } |
| |
| else { // thread->thread_state() != _thread_in_Java |
| if (sig == SIGILL && VM_Version::is_determine_features_test_running()) { |
| // SIGILL must be caused by VM_Version::determine_features(). |
| *(int *)pc = 0; // patch instruction to 0 to indicate that it causes a SIGILL, |
| // flushing of icache is not necessary. |
| stub = pc + 4; // continue with next instruction. |
| } |
| else if (thread->thread_state() == _thread_in_vm && |
| sig == SIGBUS && thread->doing_unsafe_access()) { |
| address next_pc = pc + 4; |
| next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc); |
| os::Linux::ucontext_set_pc(uc, pc + 4); |
| return true; |
| } |
| } |
| |
| // 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) && |
| // si_addr may not be valid due to a bug in the linux-ppc64 kernel (see comments above). |
| // So first check if it's indeed a "Data Storage Interrupt" (DSI), caused by load/store, |
| // and only then use is_memory_serialization instead of si_addr. |
| (ucontext_get_trap(uc) & 0x0F00 == 0x0300) && |
| ((NativeInstruction*)pc)->is_memory_serialization(thread, ucVoid)) { |
| // Synchronization problem in the pseudo memory barrier code (bug id 6546278) |
| // Block current thread until the memory serialize page permission restored. |
| os::block_on_serialize_page_trap(); |
| return true; |
| } |
| } |
| |
| if (stub != NULL) { |
| // Save all thread context in case we need to restore it. |
| if (thread != NULL) thread->set_saved_exception_pc(pc); |
| os::Linux::ucontext_set_pc(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(uc); |
| } |
| |
| report_and_die: |
| // unmask current signal |
| sigset_t newset; |
| sigemptyset(&newset); |
| sigaddset(&newset, sig); |
| sigprocmask(SIG_UNBLOCK, &newset, NULL); |
| |
| VMError::report_and_die(t, sig, pc, info, ucVoid); |
| |
| ShouldNotReachHere(); |
| return false; |
| } |
| |
| void os::Linux::init_thread_fpu_state(void) { |
| // Disable FP exceptions. |
| __asm__ __volatile__ ("mtfsfi 6,0"); |
| } |
| |
| int os::Linux::get_fpu_control_word(void) { |
| // x86 has problems with FPU precision after pthread_cond_timedwait(). |
| // nothing to do on ppc64. |
| return 0; |
| } |
| |
| void os::Linux::set_fpu_control_word(int fpu_control) { |
| // x86 has problems with FPU precision after pthread_cond_timedwait(). |
| // nothing to do on ppc64. |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // thread stack |
| |
| // Minimum usable stack sizes required to get to user code. Space for |
| // HotSpot guard pages is added later. |
| size_t os::Posix::_compiler_thread_min_stack_allowed = 64 * K; |
| size_t os::Posix::_java_thread_min_stack_allowed = 64 * K; |
| size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K; |
| |
| // Return default stack size for thr_type. |
| size_t os::Posix::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 : 1024 * K); |
| return s; |
| } |
| |
| ///////////////////////////////////////////////////////////////////////////// |
| // helper functions for fatal error handler |
| |
| void os::print_context(outputStream *st, const void *context) { |
| if (context == NULL) return; |
| |
| const ucontext_t* uc = (const ucontext_t*)context; |
| |
| st->print_cr("Registers:"); |
| st->print("pc =" INTPTR_FORMAT " ", uc->uc_mcontext.regs->nip); |
| st->print("lr =" INTPTR_FORMAT " ", uc->uc_mcontext.regs->link); |
| st->print("ctr=" INTPTR_FORMAT " ", uc->uc_mcontext.regs->ctr); |
| st->cr(); |
| for (int i = 0; i < 32; i++) { |
| st->print("r%-2d=" INTPTR_FORMAT " ", i, uc->uc_mcontext.regs->gpr[i]); |
| if (i % 3 == 2) st->cr(); |
| } |
| st->cr(); |
| st->cr(); |
| |
| intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); |
| st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp)); |
| print_hex_dump(st, (address)sp, (address)(sp + 128), 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); |
| print_instructions(st, pc, /*instrsize=*/4); |
| st->cr(); |
| } |
| |
| void os::print_register_info(outputStream *st, const void *context) { |
| if (context == NULL) return; |
| |
| const ucontext_t *uc = (const ucontext_t*)context; |
| |
| st->print_cr("Register to memory mapping:"); |
| st->cr(); |
| |
| st->print("pc ="); print_location(st, (intptr_t)uc->uc_mcontext.regs->nip); |
| st->print("lr ="); print_location(st, (intptr_t)uc->uc_mcontext.regs->link); |
| st->print("ctr ="); print_location(st, (intptr_t)uc->uc_mcontext.regs->ctr); |
| for (int i = 0; i < 32; i++) { |
| st->print("r%-2d=", i); |
| print_location(st, uc->uc_mcontext.regs->gpr[i]); |
| } |
| st->cr(); |
| } |
| |
| extern "C" { |
| int SpinPause() { |
| return 0; |
| } |
| } |
| |
| #ifndef PRODUCT |
| void os::verify_stack_alignment() { |
| assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); |
| } |
| #endif |
| |
| int os::extra_bang_size_in_bytes() { |
| // PPC does not require the additional stack bang. |
| return 0; |
| } |
