1 /*
   2  * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 
  26 package jdk.tools.jaotc.amd64;
  27 
  28 import static jdk.vm.ci.amd64.AMD64.rax;
  29 import static jdk.vm.ci.amd64.AMD64.rbx;
  30 import static jdk.vm.ci.amd64.AMD64.rip;
  31 
  32 import jdk.tools.jaotc.StubInformation;
  33 import jdk.tools.jaotc.ELFMacroAssembler;
  34 import org.graalvm.compiler.asm.amd64.AMD64Address;
  35 import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
  36 
  37 import jdk.vm.ci.code.TargetDescription;
  38 
  39 public final class AMD64ELFMacroAssembler extends AMD64MacroAssembler implements ELFMacroAssembler {
  40 
  41     private int currentEndOfInstruction;
  42 
  43     public AMD64ELFMacroAssembler(TargetDescription target) {
  44         super(target);
  45     }
  46 
  47     @Override
  48     public int currentEndOfInstruction() {
  49         return currentEndOfInstruction;
  50     }
  51 
  52     @Override
  53     public byte[] getPLTJumpCode() {
  54         // The main dispatch instruction
  55         // jmpq *0x00000000(%rip)
  56         jmp(new AMD64Address(rip, 0));
  57         currentEndOfInstruction = position();
  58 
  59         // Align to 8 bytes
  60         align(8);
  61 
  62         return close(true);
  63     }
  64 
  65     @Override
  66     public byte[] getPLTStaticEntryCode(StubInformation stub) {
  67         // The main dispatch instruction
  68         // jmpq *0x00000000(%rip)
  69         jmp(new AMD64Address(rip, 0));
  70         stub.setDispatchJumpOffset(position());
  71 
  72         // C2I stub used to call interpreter.
  73         // mov 0x00000000(%rip),%rbx Loading Method*
  74         movq(rbx, new AMD64Address(rip, 0));
  75         stub.setMovOffset(position());
  76 
  77         // jmpq *0x00000000(%rip) [c2i addr]
  78         jmp(new AMD64Address(rip, 0));
  79         stub.setC2IJumpOffset(position());
  80 
  81         // Call to VM runtime to resolve the call.
  82         // jmpq *0x00000000(%rip)
  83         stub.setResolveJumpStart(position());
  84         jmp(new AMD64Address(rip, 0));
  85         stub.setResolveJumpOffset(position());
  86         currentEndOfInstruction = position();
  87 
  88         // Align to 8 bytes
  89         align(8);
  90         stub.setSize(position());
  91 
  92         return close(true);
  93     }
  94 
  95     @Override
  96     public byte[] getPLTVirtualEntryCode(StubInformation stub) {
  97         // Klass loading instruction
  98         // mov 0x00000000(%rip),%rax
  99         movq(rax, new AMD64Address(rip, 0));
 100         stub.setMovOffset(position());
 101 
 102         // The main dispatch instruction
 103         // jmpq *0x00000000(%rip)
 104         jmp(new AMD64Address(rip, 0));
 105         stub.setDispatchJumpOffset(position());
 106 
 107         // Call to VM runtime to resolve the call.
 108         // jmpq *0x00000000(%rip)
 109         stub.setResolveJumpStart(position());
 110         jmp(new AMD64Address(rip, 0));
 111         stub.setResolveJumpOffset(position());
 112         currentEndOfInstruction = position();
 113 
 114         // Align to 8 bytes
 115         align(8);
 116         stub.setSize(position());
 117 
 118         return close(true);
 119     }
 120 
 121 }