nativeInst_zero.cpp

/*
 * Copyright (c) 2003, 2020, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2008 Red Hat, Inc.
 * 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
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 */

#include "precompiled.hpp"
#include "asm/assembler.inline.hpp"
#include "entry_zero.hpp"
#include "interpreter/zero/zeroInterpreter.hpp"
#include "nativeInst_zero.hpp"
#include "runtime/sharedRuntime.hpp"

// This method is called by nmethod::make_not_entrant_or_zombie to
// insert a jump to SharedRuntime::get_handle_wrong_method_stub()
// (dest) at the start of a compiled method (verified_entry) to avoid
// a race where a method is invoked while being made non-entrant.

void NativeJump::patch_verified_entry(address entry,
                                      address verified_entry,
                                      address dest) {
  assert(dest == SharedRuntime::get_handle_wrong_method_stub(), "should be");

  ((ZeroEntry*) verified_entry)->set_entry_point(
    (address) ZeroInterpreter::normal_entry);
}