94 lines
3.1 KiB
C#
94 lines
3.1 KiB
C#
/*
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Copyright 2017 Perfare - https://github.com/Perfare/Il2CppDumper
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Copyright 2017 Katy Coe - http://www.hearthcode.org - http://www.djkaty.com
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All rights reserved.
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*/
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using System;
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using System.IO;
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using System.Linq;
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namespace Il2CppInspector
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{
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internal class ElfReader : FileFormatReader<ElfReader>
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{
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private program_header_table[] program_table_element;
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private elf_header elf_header;
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public ElfReader(Stream stream) : base(stream) { }
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public override string Arch {
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get {
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switch (elf_header.e_machine) {
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case 0x03:
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return "x86";
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case 0x28:
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return "ARM";
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default:
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return "Unsupported";
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}
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}
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}
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protected override bool Init() {
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elf_header = ReadObject<elf_header>();
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if (elf_header.m_dwFormat != 0x464c457f) {
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// Not an ELF file
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return false;
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}
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if (elf_header.m_arch == 2)//64
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{
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// 64-bit not supported
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return false;
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}
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program_table_element = ReadArray<program_header_table>(elf_header.e_phoff, elf_header.e_phnum);
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return true;
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}
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public override uint[] GetSearchLocations() {
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// Find dynamic section
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var dynamic = new elf_32_shdr();
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var PT_DYNAMIC = program_table_element.First(x => x.p_type == 2u);
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dynamic.sh_offset = PT_DYNAMIC.p_offset;
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dynamic.sh_size = PT_DYNAMIC.p_filesz;
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// We need GOT, INIT_ARRAY and INIT_ARRAYSZ
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uint _GLOBAL_OFFSET_TABLE_ = 0;
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var init_array = new elf_32_shdr();
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Position = dynamic.sh_offset;
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var dynamicend = dynamic.sh_offset + dynamic.sh_size;
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while (Position < dynamicend) {
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var tag = ReadInt32();
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if (tag == 3) //DT_PLTGOT
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{
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_GLOBAL_OFFSET_TABLE_ = ReadUInt32();
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continue;
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}
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else if (tag == 25) //DT_INIT_ARRAY
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{
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init_array.sh_offset = MapVATR(ReadUInt32());
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continue;
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}
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else if (tag == 27) //DT_INIT_ARRAYSZ
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{
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init_array.sh_size = ReadUInt32();
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continue;
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}
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Position += 4;
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}
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if (_GLOBAL_OFFSET_TABLE_ == 0)
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throw new InvalidOperationException("Unable to get GLOBAL_OFFSET_TABLE from PT_DYNAMIC");
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GlobalOffset = _GLOBAL_OFFSET_TABLE_;
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return ReadArray<uint>(init_array.sh_offset, (int) init_array.sh_size / 4);
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}
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public override uint MapVATR(uint uiAddr)
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{
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var program_header_table = program_table_element.First(x => uiAddr >= x.p_vaddr && uiAddr <= (x.p_vaddr + x.p_memsz));
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return uiAddr - (program_header_table.p_vaddr - program_header_table.p_offset);
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}
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}
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}
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