| /* |
| * Copyright (c) 2016, 2017, 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. |
| */ |
| |
| package jdk.tools.jaotc; |
| |
| import jdk.tools.jaotc.binformat.BinaryContainer; |
| import jdk.tools.jaotc.binformat.Symbol; |
| |
| import jdk.vm.ci.code.site.Call; |
| |
| final class ForeignGotCallSiteRelocationSymbol extends CallSiteRelocationSymbol { |
| |
| ForeignGotCallSiteRelocationSymbol(CompiledMethodInfo mi, Call call, CallSiteRelocationInfo callSiteRelocation, DataBuilder dataBuilder) { |
| super(createPltSymbol(dataBuilder, mi, call, callSiteRelocation)); |
| } |
| |
| private static Symbol createPltSymbol(DataBuilder dataBuilder, CompiledMethodInfo mi, Call call, CallSiteRelocationInfo callSiteRelocation) { |
| BinaryContainer binaryContainer = dataBuilder.getBinaryContainer(); |
| String vmSymbolName = callSiteRelocation.targetSymbol; |
| |
| // Add relocation to GOT cell for call resolution jump. |
| String pltSymbolName = "plt." + vmSymbolName; |
| Symbol pltSymbol = binaryContainer.getSymbol(pltSymbolName); |
| |
| if (pltSymbol == null) { |
| String gotSymbolName = "got." + vmSymbolName; |
| Symbol gotSymbol = binaryContainer.getGotSymbol(gotSymbolName); |
| assert gotSymbol != null : "undefined VM got symbol '" + gotSymbolName + "' for call at " + call.pcOffset + " in " + mi.getMethodInfo().getSymbolName(); |
| |
| // Generate PLT jump (do it only once). |
| final int pltStartOffset = binaryContainer.getCodeContainer().getByteStreamSize(); |
| final int pltEndOffset = pltStartOffset + addPltJump(dataBuilder); |
| |
| // Link GOT cell to PLT jump. |
| pltSymbol = createCodeContainerSymbol(binaryContainer, pltSymbolName, pltStartOffset); |
| addExternalPltToGotRelocation(binaryContainer, gotSymbol, pltEndOffset); |
| } |
| |
| return pltSymbol; |
| } |
| |
| private static int addPltJump(DataBuilder dataBuilder) { |
| ELFMacroAssembler masm = ELFMacroAssembler.getELFMacroAssembler(dataBuilder.getBackend().getTarget()); |
| byte[] code = masm.getPLTJumpCode(); // It includes alignment nops. |
| int size = masm.currentEndOfInstruction(); |
| dataBuilder.getBinaryContainer().appendCodeBytes(code, 0, code.length); |
| return size; |
| } |
| |
| } |