1 /* 2 * Copyright (c) 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 package jdk.tools.jaotc.binformat.elf; 25 26 import java.nio.ByteBuffer; 27 28 import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Ehdr; 29 import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Shdr; 30 import jdk.tools.jaotc.binformat.elf.ElfTargetInfo; 31 import jdk.tools.jaotc.binformat.elf.ElfByteBuffer; 32 33 final class ElfHeader { 34 private final ByteBuffer header; 35 36 ElfHeader() { 37 header = ElfByteBuffer.allocate(Elf64_Ehdr.totalsize); 38 39 header.put(Elf64_Ehdr.e_ident.off + Elf64_Ehdr.EI_MAG0, Elf64_Ehdr.ELFMAG0); 40 header.put(Elf64_Ehdr.e_ident.off + Elf64_Ehdr.EI_MAG1, Elf64_Ehdr.ELFMAG1); 41 header.put(Elf64_Ehdr.e_ident.off + Elf64_Ehdr.EI_MAG2, Elf64_Ehdr.ELFMAG2); 42 header.put(Elf64_Ehdr.e_ident.off + Elf64_Ehdr.EI_MAG3, Elf64_Ehdr.ELFMAG3); 43 header.put(Elf64_Ehdr.e_ident.off + Elf64_Ehdr.EI_CLASS, Elf64_Ehdr.ELFCLASS64); 44 header.put(Elf64_Ehdr.e_ident.off + Elf64_Ehdr.EI_DATA, Elf64_Ehdr.ELFDATA2LSB); 45 header.put(Elf64_Ehdr.e_ident.off + Elf64_Ehdr.EI_VERSION, Elf64_Ehdr.EV_CURRENT); 46 header.put(Elf64_Ehdr.e_ident.off + Elf64_Ehdr.EI_OSABI, Elf64_Ehdr.ELFOSABI_NONE); 47 48 header.putChar(Elf64_Ehdr.e_type.off, Elf64_Ehdr.ET_REL); 49 header.putChar(Elf64_Ehdr.e_machine.off, ElfTargetInfo.getElfArch()); 50 header.putInt(Elf64_Ehdr.e_version.off, Elf64_Ehdr.EV_CURRENT); 51 header.putChar(Elf64_Ehdr.e_ehsize.off, (char) Elf64_Ehdr.totalsize); 52 header.putChar(Elf64_Ehdr.e_shentsize.off, (char) Elf64_Shdr.totalsize); 53 54 } 55 56 // Update header with file offset of first section 57 void setSectionOff(int offset) { 58 header.putLong(Elf64_Ehdr.e_shoff.off, offset); 59 } 60 61 // Update header with the number of total sections 62 void setSectionNum(int count) { 63 header.putChar(Elf64_Ehdr.e_shnum.off, (char) count); 64 } 65 66 // Update header with the section index containing the 67 // string table for section names 68 void setSectionStrNdx(int index) { 69 header.putChar(Elf64_Ehdr.e_shstrndx.off, (char) index); 70 } 71 72 byte[] getArray() { 73 return header.array(); 74 } 75 }