1 /* 2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. 3 * Copyright 2008 Red Hat, Inc. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "assembler_zero.inline.hpp" 28 #include "entry_zero.hpp" 29 #include "interpreter/cppInterpreter.hpp" 30 #include "memory/resourceArea.hpp" 31 #include "nativeInst_zero.hpp" 32 #include "oops/oop.inline.hpp" 33 #include "runtime/handles.hpp" 34 #include "runtime/sharedRuntime.hpp" 35 #include "runtime/stubRoutines.hpp" 36 #include "utilities/ostream.hpp" 37 #ifdef COMPILER1 38 #include "c1/c1_Runtime1.hpp" 39 #endif 40 41 // This method is called by nmethod::make_not_entrant_or_zombie to 42 // insert a jump to SharedRuntime::get_handle_wrong_method_stub() 43 // (dest) at the start of a compiled method (verified_entry) to avoid 44 // a race where a method is invoked while being made non-entrant. 45 // 46 // In Shark, verified_entry is a pointer to a SharkEntry. We can 47 // handle this simply by changing it's entry point to point at the 48 // interpreter. This only works because the interpreter and Shark 49 // calling conventions are the same. 50 51 void NativeJump::patch_verified_entry(address entry, 52 address verified_entry, 53 address dest) { 54 assert(dest == SharedRuntime::get_handle_wrong_method_stub(), "should be"); 55 56 #ifdef CC_INTERP 57 ((ZeroEntry*) verified_entry)->set_entry_point( 58 (address) CppInterpreter::normal_entry); 59 #else 60 Unimplemented(); 61 #endif // CC_INTERP 62 }