| /* |
| * 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.binformat.elf; |
| |
| import java.nio.ByteBuffer; |
| |
| import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Shdr; |
| import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Rel; |
| import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Rela; |
| import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Sym; |
| import jdk.tools.jaotc.binformat.elf.ElfByteBuffer; |
| |
| final class ElfSection { |
| private final String name; |
| private final ByteBuffer section; |
| private final byte[] data; |
| private final boolean hasrelocations; |
| private final int sectionIndex; |
| |
| /** |
| * String holding section name strings |
| */ |
| private final static StringBuilder sectNameTab = new StringBuilder(); |
| |
| /** |
| * Keeps track of bytes in section string table since strTabContent.length() is number of chars, |
| * not bytes. |
| */ |
| private static int shStrTabNrOfBytes = 0; |
| |
| ElfSection(String sectName, byte[] sectData, int sectFlags, int sectType, |
| boolean hasRelocations, int align, int sectIndex) { |
| |
| section = ElfByteBuffer.allocate(Elf64_Shdr.totalsize); |
| name = sectName; |
| // Return all 0's for NULL section |
| if (sectIndex == 0) { |
| sectNameTab.append('\0'); |
| shStrTabNrOfBytes += 1; |
| data = null; |
| hasrelocations = false; |
| sectionIndex = 0; |
| return; |
| } |
| |
| section.putInt(Elf64_Shdr.sh_name.off, shStrTabNrOfBytes); |
| sectNameTab.append(sectName).append('\0'); |
| shStrTabNrOfBytes += (sectName.getBytes().length + 1); |
| |
| section.putInt(Elf64_Shdr.sh_type.off, sectType); |
| section.putLong(Elf64_Shdr.sh_flags.off, sectFlags); |
| section.putLong(Elf64_Shdr.sh_addr.off, 0); |
| section.putLong(Elf64_Shdr.sh_offset.off, 0); |
| |
| if (sectName.equals(".shstrtab")) { |
| section.putLong(Elf64_Shdr.sh_size.off, shStrTabNrOfBytes); |
| data = sectNameTab.toString().getBytes(); |
| } else { |
| data = sectData; |
| section.putLong(Elf64_Shdr.sh_size.off, sectData.length); |
| } |
| |
| section.putLong(Elf64_Shdr.sh_entsize.off, 0); |
| |
| // Determine the entrysize |
| // based on type of section |
| switch (sectType) { |
| case Elf64_Shdr.SHT_SYMTAB: |
| section.putLong(Elf64_Shdr.sh_entsize.off, Elf64_Sym.totalsize); |
| break; |
| case Elf64_Shdr.SHT_RELA: |
| section.putLong(Elf64_Shdr.sh_entsize.off, Elf64_Rela.totalsize); |
| break; |
| case Elf64_Shdr.SHT_REL: |
| section.putLong(Elf64_Shdr.sh_entsize.off, Elf64_Rel.totalsize); |
| break; |
| default: |
| break; |
| } |
| section.putLong(Elf64_Shdr.sh_addralign.off, align); |
| |
| hasrelocations = hasRelocations; |
| sectionIndex = sectIndex; |
| } |
| |
| String getName() { |
| return name; |
| } |
| |
| long getSize() { |
| return section.getLong(Elf64_Shdr.sh_size.off); |
| } |
| |
| int getDataAlign() { |
| return ((int) section.getLong(Elf64_Shdr.sh_addralign.off)); |
| } |
| |
| // Alignment requirements for the Elf64_Shdr structures |
| static int getShdrAlign() { |
| return (4); |
| } |
| |
| byte[] getArray() { |
| return section.array(); |
| } |
| |
| byte[] getDataArray() { |
| return data; |
| } |
| |
| void setOffset(long offset) { |
| section.putLong(Elf64_Shdr.sh_offset.off, offset); |
| } |
| |
| void setLink(int link) { |
| section.putInt(Elf64_Shdr.sh_link.off, link); |
| } |
| |
| void setInfo(int info) { |
| section.putInt(Elf64_Shdr.sh_info.off, info); |
| } |
| |
| long getOffset() { |
| return (section.getLong(Elf64_Shdr.sh_offset.off)); |
| } |
| |
| boolean hasRelocations() { |
| return hasrelocations; |
| } |
| |
| int getSectionId() { |
| return sectionIndex; |
| } |
| |
| } |