| /* |
| * Copyright (c) 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.pecoff; |
| |
| import java.nio.ByteBuffer; |
| |
| import jdk.tools.jaotc.binformat.pecoff.PECoff.IMAGE_SECTION_HEADER; |
| import jdk.tools.jaotc.binformat.pecoff.PECoffByteBuffer; |
| |
| final class PECoffSection { |
| private final ByteBuffer section; |
| private final byte[] data; |
| private final boolean hasrelocations; |
| private final int sectionIndex; |
| private final int align; |
| |
| PECoffSection(String sectName, byte[] sectData0, int sectFlags0, int sectAlign, boolean hasRelocations, int sectIndex) { |
| |
| section = PECoffByteBuffer.allocate(IMAGE_SECTION_HEADER.totalsize); |
| |
| // If .oop.got section is empty, VM exits since .oop.got |
| // symbol ends up as external forwarded reference. |
| byte[] sectData = sectData0; |
| if (sectData0.length == 0) { |
| sectData = new byte[8]; |
| } |
| |
| // Copy only Max allowed bytes to Section Entry |
| byte[] Name = sectName.getBytes(); |
| int max = Name.length <= IMAGE_SECTION_HEADER.Name.sz ? Name.length : IMAGE_SECTION_HEADER.Name.sz; |
| |
| assert !(sectAlign < 1 || sectAlign > 1024 || (sectAlign & (sectAlign - 1)) != 0) : "section alignment is not valid: " + sectAlign; |
| align = sectAlign; |
| |
| // Using 32 because IMAGE_SCN_ALIGN_*BYTES is value + 1 |
| int sectAlignBits = (32 - Integer.numberOfLeadingZeros(align)) << IMAGE_SECTION_HEADER.IMAGE_SCN_ALIGN_SHIFT; |
| // Clear and set alignment bits |
| int sectFlags = (sectFlags0 & ~IMAGE_SECTION_HEADER.IMAGE_SCN_ALIGN_MASK) | (sectAlignBits & IMAGE_SECTION_HEADER.IMAGE_SCN_ALIGN_MASK); |
| |
| section.put(Name, IMAGE_SECTION_HEADER.Name.off, max); |
| |
| section.putInt(IMAGE_SECTION_HEADER.VirtualSize.off, 0); |
| section.putInt(IMAGE_SECTION_HEADER.VirtualAddress.off, 0); |
| section.putInt(IMAGE_SECTION_HEADER.SizeOfRawData.off, sectData.length); |
| section.putInt(IMAGE_SECTION_HEADER.PointerToLinenumbers.off, 0); |
| section.putChar(IMAGE_SECTION_HEADER.NumberOfLinenumbers.off, (char) 0); |
| |
| section.putInt(IMAGE_SECTION_HEADER.Characteristics.off, sectFlags); |
| |
| data = sectData; |
| hasrelocations = hasRelocations; |
| sectionIndex = sectIndex; |
| } |
| |
| long getSize() { |
| return section.getInt(IMAGE_SECTION_HEADER.SizeOfRawData.off); |
| } |
| |
| int getDataAlign() { |
| return (align); |
| } |
| |
| // Alignment requirements for the IMAGE_SECTION_HEADER structures |
| static int getShdrAlign() { |
| return (4); |
| } |
| |
| byte[] getArray() { |
| return section.array(); |
| } |
| |
| byte[] getDataArray() { |
| return data; |
| } |
| |
| void setOffset(long offset) { |
| section.putInt(IMAGE_SECTION_HEADER.PointerToRawData.off, (int) offset); |
| } |
| |
| long getOffset() { |
| return (section.getInt(IMAGE_SECTION_HEADER.PointerToRawData.off)); |
| } |
| |
| void setReloff(int offset) { |
| section.putInt(IMAGE_SECTION_HEADER.PointerToRelocations.off, offset); |
| } |
| |
| void setRelcount(int count) { |
| // If the number of relocs is larger than 65K, then set |
| // the overflow bit. The real count will be written to |
| // the first reloc entry for this section. |
| if (count > 0xFFFF) { |
| int flags; |
| section.putChar(IMAGE_SECTION_HEADER.NumberOfRelocations.off, (char) 0xFFFF); |
| flags = section.getInt(IMAGE_SECTION_HEADER.Characteristics.off); |
| flags |= IMAGE_SECTION_HEADER.IMAGE_SCN_LNK_NRELOC_OVFL; |
| section.putInt(IMAGE_SECTION_HEADER.Characteristics.off, flags); |
| } else { |
| section.putChar(IMAGE_SECTION_HEADER.NumberOfRelocations.off, (char) count); |
| } |
| } |
| |
| boolean hasRelocations() { |
| return hasrelocations; |
| } |
| |
| int getSectionId() { |
| return sectionIndex; |
| } |
| |
| } |