src/hotspot/os_cpu/linux_zero/os_linux_zero.cpp
author jcm
Mon, 24 Jun 2019 11:37:56 -0700
changeset 55490 3f3dc00a69a5
parent 52460 f1bb77833b59
permissions -rw-r--r--
8191278: MappedByteBuffer bulk access memory failures are not handled gracefully Summary: Unsafe.copy*Memory access failures are handled gracefully. Reviewed-by: kvn, dcubed, thartmann, coleenp, aph Contributed-by: harold.seigel@oracle.com, jamsheed.c.m@oracle.com
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/*
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 * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
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 * Copyright 2007, 2008, 2009, 2010 Red Hat, Inc.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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// no precompiled headers
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#include "jvm.h"
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#include "assembler_zero.inline.hpp"
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#include "classfile/classLoader.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "code/icBuffer.hpp"
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#include "code/vtableStubs.hpp"
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#include "interpreter/interpreter.hpp"
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#include "memory/allocation.inline.hpp"
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#include "nativeInst_zero.hpp"
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#include "os_share_linux.hpp"
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#include "prims/jniFastGetField.hpp"
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#include "prims/jvm_misc.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/extendedPC.hpp"
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#include "runtime/frame.inline.hpp"
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#include "runtime/interfaceSupport.inline.hpp"
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#include "runtime/java.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/osThread.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "runtime/stubRoutines.hpp"
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#include "runtime/thread.inline.hpp"
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#include "runtime/timer.hpp"
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#include "utilities/align.hpp"
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#include "utilities/events.hpp"
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#include "utilities/vmError.hpp"
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// See stubGenerator_zero.cpp
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#include <setjmp.h>
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extern sigjmp_buf* get_jmp_buf_for_continuation();
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address os::current_stack_pointer() {
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  // return the address of the current function
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  return (address)__builtin_frame_address(0);
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}
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frame os::get_sender_for_C_frame(frame* fr) {
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  ShouldNotCallThis();
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  return frame(NULL, NULL); // silence compile warning.
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}
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frame os::current_frame() {
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  // The only thing that calls this is the stack printing code in
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  // VMError::report:
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  //   - Step 110 (printing stack bounds) uses the sp in the frame
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  //     to determine the amount of free space on the stack.  We
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  //     set the sp to a close approximation of the real value in
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  //     order to allow this step to complete.
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  //   - Step 120 (printing native stack) tries to walk the stack.
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  //     The frame we create has a NULL pc, which is ignored as an
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  //     invalid frame.
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  frame dummy = frame();
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  dummy.set_sp((intptr_t *) current_stack_pointer());
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  return dummy;
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}
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char* os::non_memory_address_word() {
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  // Must never look like an address returned by reserve_memory,
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  // even in its subfields (as defined by the CPU immediate fields,
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  // if the CPU splits constants across multiple instructions).
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#ifdef SPARC
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  // On SPARC, 0 != %hi(any real address), because there is no
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  // allocation in the first 1Kb of the virtual address space.
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  return (char *) 0;
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#else
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  // This is the value for x86; works pretty well for PPC too.
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  return (char *) -1;
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#endif // SPARC
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}
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address os::Linux::ucontext_get_pc(const ucontext_t* uc) {
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  ShouldNotCallThis();
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  return NULL; // silence compile warnings
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}
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void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) {
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  ShouldNotCallThis();
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}
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ExtendedPC os::fetch_frame_from_context(const void* ucVoid,
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                                        intptr_t** ret_sp,
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                                        intptr_t** ret_fp) {
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  ShouldNotCallThis();
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  return NULL; // silence compile warnings
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}
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frame os::fetch_frame_from_context(const void* ucVoid) {
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  ShouldNotCallThis();
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  return frame(NULL, NULL); // silence compile warnings
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}
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extern "C" JNIEXPORT int
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JVM_handle_linux_signal(int sig,
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                        siginfo_t* info,
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                        void* ucVoid,
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                        int abort_if_unrecognized) {
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  ucontext_t* uc = (ucontext_t*) ucVoid;
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  Thread* t = Thread::current_or_null_safe();
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  SignalHandlerMark shm(t);
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  // handle SafeFetch faults
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  if (sig == SIGSEGV || sig == SIGBUS) {
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    sigjmp_buf* const pjb = get_jmp_buf_for_continuation();
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    if (pjb) {
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      siglongjmp(*pjb, 1);
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    }
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  }
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  // Note: it's not uncommon that JNI code uses signal/sigset to
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  // install then restore certain signal handler (e.g. to temporarily
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  // block SIGPIPE, or have a SIGILL handler when detecting CPU
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  // type). When that happens, JVM_handle_linux_signal() might be
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  // invoked with junk info/ucVoid. To avoid unnecessary crash when
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  // libjsig is not preloaded, try handle signals that do not require
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  // siginfo/ucontext first.
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  if (sig == SIGPIPE || sig == SIGXFSZ) {
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    // allow chained handler to go first
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    if (os::Linux::chained_handler(sig, info, ucVoid)) {
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      return true;
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    } else {
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      // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219
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      return true;
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    }
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  }
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  JavaThread* thread = NULL;
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  VMThread* vmthread = NULL;
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  if (os::Linux::signal_handlers_are_installed) {
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    if (t != NULL ){
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      if(t->is_Java_thread()) {
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        thread = (JavaThread*)t;
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      }
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      else if(t->is_VM_thread()){
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        vmthread = (VMThread *)t;
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      }
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    }
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  }
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  if (info != NULL && thread != NULL) {
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    // Handle ALL stack overflow variations here
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    if (sig == SIGSEGV) {
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      address addr = (address) info->si_addr;
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      // check if fault address is within thread stack
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      if (thread->on_local_stack(addr)) {
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        // stack overflow
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        if (thread->in_stack_yellow_reserved_zone(addr)) {
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          thread->disable_stack_yellow_reserved_zone();
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          ShouldNotCallThis();
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        }
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        else if (thread->in_stack_red_zone(addr)) {
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          thread->disable_stack_red_zone();
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          ShouldNotCallThis();
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        }
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        else {
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          // Accessing stack address below sp may cause SEGV if
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          // current thread has MAP_GROWSDOWN stack. This should
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          // only happen when current thread was created by user
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          // code with MAP_GROWSDOWN flag and then attached to VM.
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          // See notes in os_linux.cpp.
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          if (thread->osthread()->expanding_stack() == 0) {
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            thread->osthread()->set_expanding_stack();
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            if (os::Linux::manually_expand_stack(thread, addr)) {
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              thread->osthread()->clear_expanding_stack();
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              return true;
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            }
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            thread->osthread()->clear_expanding_stack();
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          }
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          else {
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            fatal("recursive segv. expanding stack.");
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          }
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        }
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      }
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    }
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    /*if (thread->thread_state() == _thread_in_Java) {
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      ShouldNotCallThis();
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    }
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    else*/ if ((thread->thread_state() == _thread_in_vm ||
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               thread->thread_state() == _thread_in_native) &&
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               sig == SIGBUS && thread->doing_unsafe_access()) {
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      ShouldNotCallThis();
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    }
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    // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC
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    // kicks in and the heap gets shrunk before the field access.
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    /*if (sig == SIGSEGV || sig == SIGBUS) {
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      address addr = JNI_FastGetField::find_slowcase_pc(pc);
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      if (addr != (address)-1) {
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        stub = addr;
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      }
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    }*/
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  }
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  // signal-chaining
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  if (os::Linux::chained_handler(sig, info, ucVoid)) {
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     return true;
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  }
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  if (!abort_if_unrecognized) {
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    // caller wants another chance, so give it to him
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    return false;
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  }
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#ifndef PRODUCT
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  if (sig == SIGSEGV) {
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    fatal("\n#"
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          "\n#    /--------------------\\"
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          "\n#    | segmentation fault |"
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          "\n#    \\---\\ /--------------/"
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          "\n#        /"
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          "\n#    [-]        |\\_/|    "
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          "\n#    (+)=C      |o o|__  "
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          "\n#    | |        =-*-=__\\ "
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          "\n#    OOO        c_c_(___)");
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  }
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#endif // !PRODUCT
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  char buf[64];
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  sprintf(buf, "caught unhandled signal %d", sig);
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// Silence -Wformat-security warning for fatal()
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PRAGMA_DIAG_PUSH
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PRAGMA_FORMAT_NONLITERAL_IGNORED
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  fatal(buf);
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PRAGMA_DIAG_POP
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  return true; // silence compiler warnings
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}
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void os::Linux::init_thread_fpu_state(void) {
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  // Nothing to do
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}
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int os::Linux::get_fpu_control_word() {
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  ShouldNotCallThis();
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  return -1; // silence compile warnings
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}
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void os::Linux::set_fpu_control_word(int fpu) {
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  ShouldNotCallThis();
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}
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bool os::is_allocatable(size_t bytes) {
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#ifdef _LP64
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  return true;
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#else
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  if (bytes < 2 * G) {
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    return true;
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  }
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  char* addr = reserve_memory(bytes, NULL);
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  if (addr != NULL) {
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    release_memory(addr, bytes);
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  }
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  return addr != NULL;
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#endif // _LP64
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}
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///////////////////////////////////////////////////////////////////////////////
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// thread stack
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size_t os::Posix::_compiler_thread_min_stack_allowed = 64 * K;
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size_t os::Posix::_java_thread_min_stack_allowed = 64 * K;
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size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K;
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size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
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#ifdef _LP64
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  size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
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#else
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  size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K);
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#endif // _LP64
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  return s;
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}
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static void current_stack_region(address *bottom, size_t *size) {
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  pthread_attr_t attr;
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  int res = pthread_getattr_np(pthread_self(), &attr);
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  if (res != 0) {
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    if (res == ENOMEM) {
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      vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np");
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    }
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    else {
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      fatal("pthread_getattr_np failed with error = %d", res);
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    }
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  }
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  address stack_bottom;
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  size_t stack_bytes;
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  res = pthread_attr_getstack(&attr, (void **) &stack_bottom, &stack_bytes);
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  if (res != 0) {
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    fatal("pthread_attr_getstack failed with error = %d", res);
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  }
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  address stack_top = stack_bottom + stack_bytes;
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  // The block of memory returned by pthread_attr_getstack() includes
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  // guard pages where present.  We need to trim these off.
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  size_t page_bytes = os::Linux::page_size();
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  assert(((intptr_t) stack_bottom & (page_bytes - 1)) == 0, "unaligned stack");
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   333
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  size_t guard_bytes;
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  res = pthread_attr_getguardsize(&attr, &guard_bytes);
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   336
  if (res != 0) {
33105
294e48b4f704 8080775: Better argument formatting for assert() and friends
david
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    fatal("pthread_attr_getguardsize failed with errno = %d", res);
4013
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  }
46619
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   339
  int guard_pages = align_up(guard_bytes, page_bytes) / page_bytes;
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  assert(guard_bytes == guard_pages * page_bytes, "unaligned guard");
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   341
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#ifdef IA64
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  // IA64 has two stacks sharing the same area of memory, a normal
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  // stack growing downwards and a register stack growing upwards.
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  // Guard pages, if present, are in the centre.  This code splits
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   346
  // the stack in two even without guard pages, though in theory
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   347
  // there's nothing to stop us allocating more to the normal stack
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  // or more to the register stack if one or the other were found
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  // to grow faster.
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  int total_pages = align_down(stack_bytes, page_bytes) / page_bytes;
4013
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  stack_bottom += (total_pages - guard_pages) / 2 * page_bytes;
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#endif // IA64
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   353
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  stack_bottom += guard_bytes;
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   355
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  pthread_attr_destroy(&attr);
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   357
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   358
  // The initial thread has a growable stack, and the size reported
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   359
  // by pthread_attr_getstack is the maximum size it could possibly
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   360
  // be given what currently mapped.  This can be huge, so we cap it.
48019
827e4ac05579 8191663: Zero variant broken after 8189170 and 8189871
glaubitz
parents: 47765
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   361
  if (os::is_primordial_thread()) {
4013
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   362
    stack_bytes = stack_top - stack_bottom;
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   363
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   364
    if (stack_bytes > JavaThread::stack_size_at_create())
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   365
      stack_bytes = JavaThread::stack_size_at_create();
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   366
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   367
    stack_bottom = stack_top - stack_bytes;
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   368
  }
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   369
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   370
  assert(os::current_stack_pointer() >= stack_bottom, "should do");
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   371
  assert(os::current_stack_pointer() < stack_top, "should do");
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   372
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   373
  *bottom = stack_bottom;
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   374
  *size = stack_top - stack_bottom;
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   375
}
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   376
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   377
address os::current_stack_base() {
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   378
  address bottom;
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   379
  size_t size;
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   380
  current_stack_region(&bottom, &size);
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   381
  return bottom + size;
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   382
}
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   383
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   384
size_t os::current_stack_size() {
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   385
  // stack size includes normal stack and HotSpot guard pages
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parents:
diff changeset
   386
  address bottom;
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diff changeset
   387
  size_t size;
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diff changeset
   388
  current_stack_region(&bottom, &size);
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   389
  return size;
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   390
}
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diff changeset
   391
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   392
/////////////////////////////////////////////////////////////////////////////
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   393
// helper functions for fatal error handler
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diff changeset
   394
35077
8b86440d3bf1 8145114: const-correctness for ucontext_t* reading functions
stuefe
parents: 34633
diff changeset
   395
void os::print_context(outputStream* st, const void* context) {
4013
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diff changeset
   396
  ShouldNotCallThis();
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parents:
diff changeset
   397
}
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diff changeset
   398
35077
8b86440d3bf1 8145114: const-correctness for ucontext_t* reading functions
stuefe
parents: 34633
diff changeset
   399
void os::print_register_info(outputStream *st, const void *context) {
7395
08bfc4ce3045 7002129: Zero and Shark fixes, 3rd
twisti
parents: 6271
diff changeset
   400
  ShouldNotCallThis();
08bfc4ce3045 7002129: Zero and Shark fixes, 3rd
twisti
parents: 6271
diff changeset
   401
}
08bfc4ce3045 7002129: Zero and Shark fixes, 3rd
twisti
parents: 6271
diff changeset
   402
4013
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   403
/////////////////////////////////////////////////////////////////////////////
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parents:
diff changeset
   404
// Stubs for things that would be in linux_zero.s if it existed.
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   405
// You probably want to disassemble these monkeys to check they're ok.
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parents:
diff changeset
   406
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   407
extern "C" {
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diff changeset
   408
  int SpinPause() {
36181
3a16e8ce0abf 8143245: Zero build requires disabled warnings
sgehwolf
parents: 35201
diff changeset
   409
      return -1; // silence compile warnings
4013
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diff changeset
   410
  }
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   411
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parents:
diff changeset
   412
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diff changeset
   413
  void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) {
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diff changeset
   414
    if (from > to) {
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parents:
diff changeset
   415
      jshort *end = from + count;
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   416
      while (from < end)
b154310845de 6890308: integrate zero assembler hotspot changes
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diff changeset
   417
        *(to++) = *(from++);
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parents:
diff changeset
   418
    }
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diff changeset
   419
    else if (from < to) {
b154310845de 6890308: integrate zero assembler hotspot changes
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diff changeset
   420
      jshort *end = from;
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diff changeset
   421
      from += count - 1;
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   422
      to   += count - 1;
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   423
      while (from >= end)
b154310845de 6890308: integrate zero assembler hotspot changes
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diff changeset
   424
        *(to--) = *(from--);
b154310845de 6890308: integrate zero assembler hotspot changes
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diff changeset
   425
    }
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   426
  }
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diff changeset
   427
  void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) {
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   428
    if (from > to) {
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   429
      jint *end = from + count;
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   430
      while (from < end)
b154310845de 6890308: integrate zero assembler hotspot changes
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diff changeset
   431
        *(to++) = *(from++);
b154310845de 6890308: integrate zero assembler hotspot changes
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diff changeset
   432
    }
b154310845de 6890308: integrate zero assembler hotspot changes
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diff changeset
   433
    else if (from < to) {
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   434
      jint *end = from;
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   435
      from += count - 1;
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   436
      to   += count - 1;
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   437
      while (from >= end)
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   438
        *(to--) = *(from--);
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   439
    }
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   440
  }
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   441
  void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) {
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   442
    if (from > to) {
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   443
      jlong *end = from + count;
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   444
      while (from < end)
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   445
        os::atomic_copy64(from++, to++);
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   446
    }
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   447
    else if (from < to) {
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   448
      jlong *end = from;
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   449
      from += count - 1;
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   450
      to   += count - 1;
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   451
      while (from >= end)
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   452
        os::atomic_copy64(from--, to--);
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   453
    }
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   454
  }
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   455
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   456
  void _Copy_arrayof_conjoint_bytes(HeapWord* from,
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   457
                                    HeapWord* to,
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   458
                                    size_t    count) {
6271
271ac8e393e4 6977640: Zero and Shark fixes
twisti
parents: 5547
diff changeset
   459
    memmove(to, from, count);
4013
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   460
  }
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   461
  void _Copy_arrayof_conjoint_jshorts(HeapWord* from,
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   462
                                      HeapWord* to,
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   463
                                      size_t    count) {
6271
271ac8e393e4 6977640: Zero and Shark fixes
twisti
parents: 5547
diff changeset
   464
    memmove(to, from, count * 2);
4013
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   465
  }
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   466
  void _Copy_arrayof_conjoint_jints(HeapWord* from,
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   467
                                    HeapWord* to,
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   468
                                    size_t    count) {
6271
271ac8e393e4 6977640: Zero and Shark fixes
twisti
parents: 5547
diff changeset
   469
    memmove(to, from, count * 4);
4013
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   470
  }
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   471
  void _Copy_arrayof_conjoint_jlongs(HeapWord* from,
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   472
                                     HeapWord* to,
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   473
                                     size_t    count) {
6271
271ac8e393e4 6977640: Zero and Shark fixes
twisti
parents: 5547
diff changeset
   474
    memmove(to, from, count * 8);
4013
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   475
  }
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   476
};
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   477
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   478
/////////////////////////////////////////////////////////////////////////////
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   479
// Implementations of atomic operations not supported by processors.
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   480
//  -- http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Atomic-Builtins.html
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parents:
diff changeset
   481
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   482
#ifndef _LP64
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   483
extern "C" {
b154310845de 6890308: integrate zero assembler hotspot changes
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parents:
diff changeset
   484
  long long unsigned int __sync_val_compare_and_swap_8(
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   485
    volatile void *ptr,
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   486
    long long unsigned int oldval,
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   487
    long long unsigned int newval) {
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   488
    ShouldNotCallThis();
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   489
  }
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   490
};
b154310845de 6890308: integrate zero assembler hotspot changes
never
parents:
diff changeset
   491
#endif // !_LP64
11961
0abd4cd26e5a 7147740: add assertions to check stack alignment on VM entry from generated code (x64)
roland
parents: 8921
diff changeset
   492
0abd4cd26e5a 7147740: add assertions to check stack alignment on VM entry from generated code (x64)
roland
parents: 8921
diff changeset
   493
#ifndef PRODUCT
0abd4cd26e5a 7147740: add assertions to check stack alignment on VM entry from generated code (x64)
roland
parents: 8921
diff changeset
   494
void os::verify_stack_alignment() {
0abd4cd26e5a 7147740: add assertions to check stack alignment on VM entry from generated code (x64)
roland
parents: 8921
diff changeset
   495
}
0abd4cd26e5a 7147740: add assertions to check stack alignment on VM entry from generated code (x64)
roland
parents: 8921
diff changeset
   496
#endif
26576
a9429d24d429 8050147: StoreLoad barrier interferes with stack usages
shade
parents: 22234
diff changeset
   497
a9429d24d429 8050147: StoreLoad barrier interferes with stack usages
shade
parents: 22234
diff changeset
   498
int os::extra_bang_size_in_bytes() {
a9429d24d429 8050147: StoreLoad barrier interferes with stack usages
shade
parents: 22234
diff changeset
   499
  // Zero does not require an additional stack banging.
a9429d24d429 8050147: StoreLoad barrier interferes with stack usages
shade
parents: 22234
diff changeset
   500
  return 0;
a9429d24d429 8050147: StoreLoad barrier interferes with stack usages
shade
parents: 22234
diff changeset
   501
}