IL2CPP: Change metadata and binary to derive from BinaryObjectStream
This commit is contained in:
Katy Coe
130
Il2CppInspector.Common/FileFormatStreams/SElfReader.cs
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130
Il2CppInspector.Common/FileFormatStreams/SElfReader.cs
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/*
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Copyright 2020 Katy Coe - http://www.djkaty.com - https://github.com/djkaty
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All rights reserved.
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*/
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Reflection;
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using System.Runtime.InteropServices;
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using System.Text;
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using NoisyCowStudios.Bin2Object;
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namespace Il2CppInspector
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{
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// Sony PlayStation 4 fake signed ELF reader
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// Not compatible with PlayStation 3, PSP or Vita
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// References:
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// http://hitmen.c02.at/files/yapspd/psp_doc/chap26.html
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// https://www.psdevwiki.com/ps3/SELF_-_SPRX#File_Format
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// https://www.psdevwiki.com/ps4/SELF_File_Format
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// https://www.psxhax.com/threads/ps4-self-spkg-file-format-documentation-detailed-for-scene-devs.6636/
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// https://wiki.henkaku.xyz/vita/images/a/a2/Vita_SDK_specifications.pdf
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// https://www.psxhax.com/threads/make-fself-gui-for-flat_zs-make_fself-py-script-by-cfwprophet.3494/
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internal class SElfReader : FileFormatStream<SElfReader>
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{
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public override string DefaultFilename => "libil2cpp.so";
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public override string Format => sceData.ProductType == (ulong) SElfExInfoTypes.PTYPE_FAKE? "FSELF" : "SELF";
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public override string Arch => "x64";
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public override int Bits => 64;
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private SElfHeader selfHeader;
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private SElfEntry[] entries;
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private SElfSCEData sceData;
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private elf_header<ulong> elfHeader;
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private elf_64_phdr[] pht;
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private elf_64_phdr getProgramHeader(Elf programIndex) => pht.FirstOrDefault(x => x.p_type == (uint) programIndex);
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protected override bool Init() {
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selfHeader = ReadObject<SElfHeader>();
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// Check for magic bytes
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if ((SElfConsts) selfHeader.Magic != SElfConsts.Magic)
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return false;
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if (selfHeader.Endian != 0x1)
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Endianness = Endianness.Big;
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// Read entries
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entries = ReadArray<SElfEntry>(selfHeader.NumberOfEntries);
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// We can't deal with encrypted or compressed segments right now
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if (entries.Any(e => e.HasBlocks && e.IsEncrypted))
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throw new NotImplementedException("This file contains encrypted segments not currently supported by Il2CppInspector.");
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if (entries.Any(e => e.HasBlocks && e.IsDeflated))
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throw new NotImplementedException("This file contains compressed segments not currently supported by Il2CppInspector.");
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// Read ELF header
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// PS4 files as follows:
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// m_arch = 0x2 (64-bit)
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// m_endian = 0x1 (little endian)
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// m_version = 0x1 (ELF version 1)
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// m_osabi = 0x9 (FreeBSD)
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// e_type = special type, see psdevwiki documentation; probably 0xFE10 or 0xFE18
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// e_machine = 0x3E (x86-64)
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var startOfElf = Position;
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elfHeader = ReadObject<elf_header<ulong>>();
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// Must be one of these supported binary types
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if (elfHeader.e_type != (ushort) Elf.ET_EXEC
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&& elfHeader.e_type != (ushort) SElfETypes.ET_SCE_EXEC
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&& elfHeader.e_type != (ushort) SElfETypes.ET_SCE_DYNEXEC
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&& elfHeader.e_type != (ushort) SElfETypes.ET_SCE_DYNAMIC)
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return false;
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// There are no sections, but read all the program headers
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// Each segment of type PT_LOAD, PT_SCE_RELRO, PT_SCE_DYNLIBDATA and PT_SCE_COMMENT
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// generates two SELF entries above - one pointing to the ELF segment and one pointing to a digest.
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// Only p_vaddr is used for memory mapping; all other fields are ignored.
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// offset, memsz and filesz are taken from the SELF entries.
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// The digests are all-zero in FSELF files.
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// All other ELF segments are ignored completely.
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pht = ReadArray<elf_64_phdr>(startOfElf + (long) elfHeader.e_phoff, elfHeader.e_phnum);
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// Read extended info
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sceData = ReadObject<SElfSCEData>(startOfElf + (long) elfHeader.e_phoff + elfHeader.e_phentsize * elfHeader.e_phnum);
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// Get SELF entries which point to segments defined in phdrs
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var dataEntries = entries.Where(e => e.HasBlocks).ToList();
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// Fixup the used phdr entries
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foreach (var entry in dataEntries) {
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pht[entry.SegmentIndex].f_p_filesz = entry.EncryptedCompressedSize;
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pht[entry.SegmentIndex].f_p_offset = entry.FileOffset;
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pht[entry.SegmentIndex].f_p_memsz = entry.MemorySize;
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}
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// Filter out unused phdr entries
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var phdrIndices = dataEntries.Select(e => (int) e.SegmentIndex).ToList();
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pht = pht.Where((e, i) => phdrIndices.Contains(i)).ToArray();
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// Get offset of code section
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var codeSegment = pht.First(x => ((Elf) x.p_flags & Elf.PF_X) == Elf.PF_X);
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GlobalOffset = codeSegment.p_vaddr - codeSegment.p_offset;
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return true;
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}
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// Only the DT_INIT function equivalent
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public override uint[] GetFunctionTable() => new [] { MapVATR(elfHeader.e_entry) };
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public override uint MapVATR(ulong uiAddr) {
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var program_header_table = pht.First(x => uiAddr >= x.p_vaddr && uiAddr <= x.p_vaddr + x.p_filesz);
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return (uint) (uiAddr - (program_header_table.p_vaddr - program_header_table.p_offset));
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}
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public override ulong MapFileOffsetToVA(uint offset) {
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var segment = pht.First(x => offset >= x.p_offset && offset < x.p_offset + x.p_filesz);
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return segment.p_vaddr + offset - segment.p_offset;
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}
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// TODO: SElfReader.GetSections()
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}
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}
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