1 /* 2 * Copyright (c) 2002, 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, 20 * CA 94065 USA or visit www.oracle.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.asm.sparc; 26 27 import sun.jvm.hotspot.asm.*; 28 29 class JmplDecoder extends MemoryInstructionDecoder { 30 JmplDecoder() { 31 super(JMPL, "jmpl", RTLDT_UNSIGNED_WORD); 32 } 33 34 Instruction decodeMemoryInstruction(int instruction, SPARCRegisterIndirectAddress addr, 35 SPARCRegister rd, SPARCInstructionFactory factory) { 36 // this may be most probably indirect call or ret or retl 37 Instruction instr = null; 38 if (rd == SPARCRegisters.O7) { 39 instr = factory.newIndirectCallInstruction(addr, rd); 40 } else if (rd == SPARCRegisters.G0) { 41 int disp = (int) addr.getDisplacement(); 42 Register base = addr.getBase(); 43 if (base == SPARCRegisters.I7 && disp == 8) { 44 instr = factory.newReturnInstruction(addr, rd, false /* not leaf */); 45 } else if (base == SPARCRegisters.O7 && disp == 8) { 46 instr = factory.newReturnInstruction(addr, rd, true /* leaf */); 47 } else { 48 instr = factory.newJmplInstruction(addr, rd); 49 } 50 } else { 51 instr = factory.newJmplInstruction(addr, rd); 52 } 53 return instr; 54 } 55 }