1 /*
   2  * Copyright (c) 2016, 2018, 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.binformat.elf;
  27 
  28 import java.nio.ByteOrder;
  29 import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Ehdr;
  30 
  31 /**
  32  * Class that abstracts MACH-O target details.
  33  *
  34  */
  35 final class ElfTargetInfo {
  36     /**
  37      * Target architecture.
  38      */
  39     private static final char arch;
  40 
  41     /**
  42      * Architecture endian-ness.
  43      */
  44     private static final int endian = Elf64_Ehdr.ELFDATA2LSB;
  45 
  46     /**
  47      * Target OS string.
  48      */
  49     private static String osName;
  50 
  51     static {
  52         // Find the target arch details
  53         String archStr = System.getProperty("os.arch").toLowerCase();
  54         if (ByteOrder.nativeOrder() != ByteOrder.LITTLE_ENDIAN) {
  55             System.out.println("Only Little Endian byte order supported!");
  56         }
  57 
  58         if (archStr.equals("amd64") || archStr.equals("x86_64")) {
  59             arch = Elf64_Ehdr.EM_X86_64;
  60         } else if (archStr.equals("aarch64")) {
  61             arch = Elf64_Ehdr.EM_AARCH64;
  62         } else {
  63             System.out.println("Unsupported architecture " + archStr);
  64             arch = Elf64_Ehdr.EM_NONE;
  65         }
  66 
  67         osName = System.getProperty("os.name").toLowerCase();
  68         if (!osName.equals("linux") && !osName.equals("sunos")) {
  69             System.out.println("Unsupported Operating System " + osName);
  70             osName = "Unknown";
  71         }
  72     }
  73 
  74     static char getElfArch() {
  75         return arch;
  76     }
  77 
  78     static int getElfEndian() {
  79         return endian;
  80     }
  81 
  82     static String getOsName() {
  83         return osName;
  84     }
  85 }