Fix some issues loading ELFs with invalid SHTs and broken symbol entries
This commit is contained in:
LukeFZ
@@ -7,11 +7,8 @@
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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.Text;
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using NoisyCowStudios.Bin2Object;
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namespace Il2CppInspector
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{
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@@ -156,7 +153,17 @@ namespace Il2CppInspector
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// Get PHT and SHT
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PHT = ReadArray<TPHdr>(conv.Long(ElfHeader.e_phoff), ElfHeader.e_phnum);
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SHT = ReadArray<elf_shdr<TWord>>(conv.Long(ElfHeader.e_shoff), ElfHeader.e_shnum);
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try
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{
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SHT = ReadArray<elf_shdr<TWord>>(conv.Long(ElfHeader.e_shoff), ElfHeader.e_shnum);
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}
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catch (Exception ex)
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{
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Console.WriteLine($"Got exception {ex} while parsing SHT - reverting to PHT");
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preferPHT = true;
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SHT = [];
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}
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// Determine if SHT is valid
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@@ -385,7 +392,7 @@ namespace Il2CppInspector
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StatusUpdate("Processing symbols");
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// Three possible symbol tables in ELF files
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var pTables = new List<(TWord offset, TWord count, TWord strings)>();
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var pTables = new List<(TWord offset, TWord count, TWord strings, TWord stringsCount)>();
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// String table (a sequence of null-terminated strings, total length in sh_size
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var SHT_STRTAB = GetSection(Elf.SHT_STRTAB);
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@@ -393,32 +400,34 @@ namespace Il2CppInspector
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if (SHT_STRTAB != null) {
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// Section header shared object symbol table (.symtab)
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if (GetSection(Elf.SHT_SYMTAB) is elf_shdr<TWord> SHT_SYMTAB)
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pTables.Add((SHT_SYMTAB.sh_offset, conv.Div(SHT_SYMTAB.sh_size, SHT_SYMTAB.sh_entsize), SHT_STRTAB.sh_offset));
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pTables.Add((SHT_SYMTAB.sh_offset, conv.Div(SHT_SYMTAB.sh_size, SHT_SYMTAB.sh_entsize), SHT_STRTAB.sh_offset, SHT_STRTAB.sh_size));
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// Section header executable symbol table (.dynsym)
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if (GetSection(Elf.SHT_DYNSYM) is elf_shdr<TWord> SHT_DYNSYM)
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pTables.Add((SHT_DYNSYM.sh_offset, conv.Div(SHT_DYNSYM.sh_size, SHT_DYNSYM.sh_entsize), SHT_STRTAB.sh_offset));
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pTables.Add((SHT_DYNSYM.sh_offset, conv.Div(SHT_DYNSYM.sh_size, SHT_DYNSYM.sh_entsize), SHT_STRTAB.sh_offset, SHT_STRTAB.sh_size));
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}
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var maxStrtabAddr = conv.Add(SHT_STRTAB.sh_offset, SHT_STRTAB.sh_size);
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// Symbol table in dynamic section (DT_SYMTAB)
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// Normally the same as .dynsym except that .dynsym may be removed in stripped binaries
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// Dynamic string table
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if (GetDynamicEntry(Elf.DT_STRTAB) is elf_dynamic<TWord> DT_STRTAB) {
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if (GetDynamicEntry(Elf.DT_SYMTAB) is elf_dynamic<TWord> DT_SYMTAB) {
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// Find the next pointer in the dynamic table to calculate the length of the symbol table
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var orderedTable = (from x in DynamicTable where conv.Gt(x.d_un, DT_SYMTAB.d_un) orderby x.d_un select x).ToList();
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if (orderedTable.Count != 0)
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if (GetDynamicEntry(Elf.DT_STRSZ) is elf_dynamic<TWord> DT_STRSZ)
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{
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var end = orderedTable.First().d_un;
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// Dynamic symbol table
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pTables.Add((
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conv.FromUInt(MapVATR(conv.ULong(DT_SYMTAB.d_un))),
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conv.Div(conv.Sub(end, DT_SYMTAB.d_un), Sizeof(typeof(TSym))),
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DT_STRTAB.d_un
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));
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// Find the next pointer in the dynamic table to calculate the length of the symbol table
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var orderedTable = (from x in DynamicTable where conv.Gt(x.d_un, DT_SYMTAB.d_un) orderby x.d_un select x).ToList();
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if (orderedTable.Count != 0)
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{
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var end = orderedTable.First().d_un;
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// Dynamic symbol table
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pTables.Add((
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conv.FromUInt(MapVATR(conv.ULong(DT_SYMTAB.d_un))),
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conv.Div(conv.Sub(end, DT_SYMTAB.d_un), Sizeof(typeof(TSym))),
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DT_STRTAB.d_un,
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DT_STRSZ.d_un
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));
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}
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}
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}
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}
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@@ -432,7 +441,7 @@ namespace Il2CppInspector
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foreach (var symbol in symbol_table)
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{
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if (conv.Gt(conv.FromUInt(symbol.st_name), maxStrtabAddr))
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if (conv.Gt(conv.FromUInt(symbol.st_name), pTab.stringsCount))
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break; // Skip invalid symbol table indices, since we might read past it on obfuscated binaries
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string name = string.Empty;
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@@ -1,282 +1,283 @@
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/*
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Copyright 2017 Perfare - https://github.com/Perfare/Il2CppDumper
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Copyright 2017-2021 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 NoisyCowStudios.Bin2Object;
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namespace Il2CppInspector
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{
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[Flags]
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public enum Elf : uint
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{
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// elf_header.m_dwFormat
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ELFMAG = 0x464c457f, // "\177ELF"
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// elf_header.e_machine
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EM_386 = 0x03,
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EM_ARM = 0x28,
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EM_X86_64 = 0x3E,
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EM_AARCH64 = 0xB7,
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// elf_header.m_arch
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ELFCLASS32 = 1,
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ELFCLASS64 = 2,
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// elf_header.e_Type
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ET_EXEC = 2,
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// PHTs
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PT_LOAD = 1,
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PT_DYNAMIC = 2,
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PF_X = 1,
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PF_W = 2,
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PF_R = 4,
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// SHTs
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SHT_PROGBITS = 1,
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SHT_SYMTAB = 2,
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SHT_STRTAB = 3,
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SHT_RELA = 4,
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SHT_NOBITS = 8,
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SHT_REL = 9,
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SHT_DYNSYM = 11,
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// SHNs
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SHN_UNDEF = 0,
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// STTs
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STT_NOTYPE = 0,
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STT_OBJECT = 1,
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STT_FUNC = 2,
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STT_SECTION = 3,
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STT_FILE = 4,
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STT_COMMON = 5,
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STT_LOOS = 10,
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STT_HIOS = 12,
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STT_LOPROC = 13,
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STT_SPARC_REGISTER = 13,
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STT_HIPROC = 15,
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// SHFs
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SHF_ALLOC = 2,
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SHF_EXECINSTR = 4,
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// dynamic sections
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DT_PLTGOT = 3,
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DT_HASH = 4,
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DT_STRTAB = 5,
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DT_SYMTAB = 6,
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DT_RELA = 7,
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DT_RELASZ = 8,
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DT_RELAENT = 9,
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DT_INIT = 12,
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DT_FINI = 13,
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DT_REL = 17,
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DT_RELSZ = 18,
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DT_RELENT = 19,
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DT_JMPREL = 23,
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DT_INIT_ARRAY = 25,
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DT_FINI_ARRAY = 26,
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DT_INIT_ARRAYSZ = 27,
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DT_PREINIT_ARRAY = 32,
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DT_MOVETAB = 0x6ffffefe,
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DT_VERDEF = 0x6ffffffc,
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DT_VERNEED = 0x6ffffffe,
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DT_SYMINFO = 0x6ffffeff,
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// relocation types
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R_ARM_ABS32 = 2,
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R_ARM_REL32 = 3,
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R_ARM_COPY = 20,
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R_AARCH64_ABS64 = 0x101,
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R_AARCH64_PREL64 = 0x104,
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R_AARCH64_GLOB_DAT = 0x401,
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R_AARCH64_JUMP_SLOT = 0x402,
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R_AARCH64_RELATIVE = 0x403,
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R_386_32 = 1,
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R_386_PC32 = 2,
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R_386_GLOB_DAT = 6,
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R_386_JMP_SLOT = 7,
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R_AMD64_64 = 1
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}
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#pragma warning disable CS0649
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public class elf_header<TWord> where TWord : struct
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{
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// 0x7f followed by ELF in ascii
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public uint m_dwFormat;
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// 1 - 32 bit
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// 2 - 64 bit
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public byte m_arch;
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// 1 - little endian
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// 2 - big endian
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public byte m_endian;
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// 1 is original elf format
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public byte m_version;
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// set based on OS, refer to OSABI enum
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public byte m_osabi;
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// refer to elf documentation
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public byte m_osabi_ver;
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// unused
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[ArrayLength(FixedSize=7)]
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public byte[] e_pad;//byte[7]
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// 1 - relocatable
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// 2 - executable
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// 3 - shared
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// 4 - core
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public ushort e_type;
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// refer to isa enum
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public ushort e_machine;
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public uint e_version;
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public TWord e_entry;
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public TWord e_phoff;
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public TWord e_shoff;
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public uint e_flags;
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public ushort e_ehsize;
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public ushort e_phentsize;
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public ushort e_phnum;
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public ushort e_shentsize;
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public ushort e_shnum;
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public ushort e_shtrndx;
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}
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public interface Ielf_phdr<TWord> where TWord : struct
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{
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uint p_type { get; }
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TWord p_offset { get; set; }
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TWord p_filesz { get; set; }
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TWord p_memsz { get; }
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TWord p_vaddr { get; set; }
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uint p_flags { get; }
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}
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public class elf_32_phdr : Ielf_phdr<uint> {
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public uint p_type => f_p_type;
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public uint p_offset { get => f_p_offset; set => f_p_offset = value; }
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public uint p_filesz { get => f_p_filesz; set => f_p_filesz = value; }
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public uint p_vaddr { get => f_p_vaddr; set => f_p_vaddr = value; }
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public uint p_flags => f_p_flags;
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public uint p_memsz => f_p_memsz;
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public uint f_p_type;
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public uint f_p_offset;
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public uint f_p_vaddr;
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public uint p_paddr;
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public uint f_p_filesz;
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public uint f_p_memsz;
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public uint f_p_flags;
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public uint p_align;
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}
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public class elf_64_phdr : Ielf_phdr<ulong>
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{
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public uint p_type => f_p_type;
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public ulong p_offset { get => f_p_offset; set => f_p_offset = value; }
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public ulong p_filesz { get => f_p_filesz; set => f_p_filesz = value; }
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public ulong p_memsz => f_p_memsz;
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public ulong p_vaddr { get => f_p_vaddr; set => f_p_vaddr = value; }
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public uint p_flags => f_p_flags;
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public uint f_p_type;
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public uint f_p_flags;
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public ulong f_p_offset;
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public ulong f_p_vaddr;
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public ulong p_paddr;
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public ulong f_p_filesz;
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public ulong f_p_memsz;
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public ulong p_align;
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}
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public class elf_shdr<TWord> where TWord : struct
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{
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public uint sh_name;
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public uint sh_type;
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public TWord sh_flags;
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public TWord sh_addr;
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public TWord sh_offset;
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public TWord sh_size;
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public uint sh_link;
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public uint sh_info;
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public TWord sh_addralign;
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public TWord sh_entsize;
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}
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public interface Ielf_sym<TWord> where TWord : struct
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{
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uint st_name { get; }
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TWord st_value { get; }
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ushort st_shndx { get; }
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Elf st_info { get; }
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Elf type { get; }
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}
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public class elf_32_sym : Ielf_sym<uint>
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{
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public uint st_name => f_st_name;
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public uint st_value => f_st_value;
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public ushort st_shndx => f_st_shndx;
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public Elf st_info => (Elf) f_st_info;
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public Elf type => (Elf) (f_st_info & 0xf);
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public uint f_st_name;
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public uint f_st_value;
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public uint st_size;
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public byte f_st_info;
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public byte st_other;
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public ushort f_st_shndx;
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}
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public class elf_64_sym : Ielf_sym<ulong>
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{
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public uint st_name => f_st_name;
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public ulong st_value => f_st_value;
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public ushort st_shndx => f_st_shndx;
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public Elf st_info => (Elf) f_st_info;
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public Elf type => (Elf) (f_st_info & 0xf);
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public uint f_st_name;
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public byte f_st_info;
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public byte st_other;
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public ushort f_st_shndx;
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public ulong f_st_value;
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public ulong st_size;
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}
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public class elf_dynamic<TWord> where TWord : struct
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{
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public TWord d_tag;
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public TWord d_un;
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}
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public class elf_rel<TWord> where TWord : struct
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{
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public TWord r_offset;
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public TWord r_info;
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}
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public class elf_rela<TWord> where TWord : struct
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{
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public TWord r_offset;
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public TWord r_info;
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public TWord r_addend;
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}
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#pragma warning restore CS0649
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}
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/*
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Copyright 2017 Perfare - https://github.com/Perfare/Il2CppDumper
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Copyright 2017-2021 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 NoisyCowStudios.Bin2Object;
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namespace Il2CppInspector
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{
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[Flags]
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public enum Elf : uint
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{
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// elf_header.m_dwFormat
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ELFMAG = 0x464c457f, // "\177ELF"
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// elf_header.e_machine
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EM_386 = 0x03,
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EM_ARM = 0x28,
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EM_X86_64 = 0x3E,
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EM_AARCH64 = 0xB7,
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// elf_header.m_arch
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ELFCLASS32 = 1,
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ELFCLASS64 = 2,
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// elf_header.e_Type
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ET_EXEC = 2,
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// PHTs
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PT_LOAD = 1,
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PT_DYNAMIC = 2,
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PF_X = 1,
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PF_W = 2,
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PF_R = 4,
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// SHTs
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SHT_PROGBITS = 1,
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SHT_SYMTAB = 2,
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SHT_STRTAB = 3,
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SHT_RELA = 4,
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SHT_NOBITS = 8,
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SHT_REL = 9,
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SHT_DYNSYM = 11,
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// SHNs
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SHN_UNDEF = 0,
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// STTs
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STT_NOTYPE = 0,
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STT_OBJECT = 1,
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STT_FUNC = 2,
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STT_SECTION = 3,
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STT_FILE = 4,
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STT_COMMON = 5,
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STT_LOOS = 10,
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STT_HIOS = 12,
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STT_LOPROC = 13,
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STT_SPARC_REGISTER = 13,
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STT_HIPROC = 15,
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// SHFs
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SHF_ALLOC = 2,
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SHF_EXECINSTR = 4,
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// dynamic sections
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DT_PLTGOT = 3,
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DT_HASH = 4,
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DT_STRTAB = 5,
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DT_SYMTAB = 6,
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DT_RELA = 7,
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DT_RELASZ = 8,
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DT_RELAENT = 9,
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DT_STRSZ = 10,
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DT_INIT = 12,
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DT_FINI = 13,
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DT_REL = 17,
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DT_RELSZ = 18,
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DT_RELENT = 19,
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DT_JMPREL = 23,
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DT_INIT_ARRAY = 25,
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DT_FINI_ARRAY = 26,
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DT_INIT_ARRAYSZ = 27,
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DT_PREINIT_ARRAY = 32,
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DT_MOVETAB = 0x6ffffefe,
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DT_VERDEF = 0x6ffffffc,
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DT_VERNEED = 0x6ffffffe,
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DT_SYMINFO = 0x6ffffeff,
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// relocation types
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R_ARM_ABS32 = 2,
|
||||
R_ARM_REL32 = 3,
|
||||
R_ARM_COPY = 20,
|
||||
|
||||
R_AARCH64_ABS64 = 0x101,
|
||||
R_AARCH64_PREL64 = 0x104,
|
||||
R_AARCH64_GLOB_DAT = 0x401,
|
||||
R_AARCH64_JUMP_SLOT = 0x402,
|
||||
R_AARCH64_RELATIVE = 0x403,
|
||||
|
||||
R_386_32 = 1,
|
||||
R_386_PC32 = 2,
|
||||
R_386_GLOB_DAT = 6,
|
||||
R_386_JMP_SLOT = 7,
|
||||
|
||||
R_AMD64_64 = 1
|
||||
}
|
||||
|
||||
#pragma warning disable CS0649
|
||||
public class elf_header<TWord> where TWord : struct
|
||||
{
|
||||
// 0x7f followed by ELF in ascii
|
||||
public uint m_dwFormat;
|
||||
|
||||
// 1 - 32 bit
|
||||
// 2 - 64 bit
|
||||
public byte m_arch;
|
||||
|
||||
// 1 - little endian
|
||||
// 2 - big endian
|
||||
public byte m_endian;
|
||||
|
||||
// 1 is original elf format
|
||||
public byte m_version;
|
||||
|
||||
// set based on OS, refer to OSABI enum
|
||||
public byte m_osabi;
|
||||
|
||||
// refer to elf documentation
|
||||
public byte m_osabi_ver;
|
||||
|
||||
// unused
|
||||
[ArrayLength(FixedSize=7)]
|
||||
public byte[] e_pad;//byte[7]
|
||||
|
||||
// 1 - relocatable
|
||||
// 2 - executable
|
||||
// 3 - shared
|
||||
// 4 - core
|
||||
public ushort e_type;
|
||||
|
||||
// refer to isa enum
|
||||
public ushort e_machine;
|
||||
|
||||
public uint e_version;
|
||||
|
||||
public TWord e_entry;
|
||||
public TWord e_phoff;
|
||||
public TWord e_shoff;
|
||||
public uint e_flags;
|
||||
public ushort e_ehsize;
|
||||
public ushort e_phentsize;
|
||||
public ushort e_phnum;
|
||||
public ushort e_shentsize;
|
||||
public ushort e_shnum;
|
||||
public ushort e_shtrndx;
|
||||
}
|
||||
|
||||
public interface Ielf_phdr<TWord> where TWord : struct
|
||||
{
|
||||
uint p_type { get; }
|
||||
TWord p_offset { get; set; }
|
||||
TWord p_filesz { get; set; }
|
||||
TWord p_memsz { get; }
|
||||
TWord p_vaddr { get; set; }
|
||||
uint p_flags { get; }
|
||||
}
|
||||
|
||||
public class elf_32_phdr : Ielf_phdr<uint> {
|
||||
public uint p_type => f_p_type;
|
||||
public uint p_offset { get => f_p_offset; set => f_p_offset = value; }
|
||||
public uint p_filesz { get => f_p_filesz; set => f_p_filesz = value; }
|
||||
public uint p_vaddr { get => f_p_vaddr; set => f_p_vaddr = value; }
|
||||
public uint p_flags => f_p_flags;
|
||||
public uint p_memsz => f_p_memsz;
|
||||
|
||||
public uint f_p_type;
|
||||
public uint f_p_offset;
|
||||
public uint f_p_vaddr;
|
||||
public uint p_paddr;
|
||||
public uint f_p_filesz;
|
||||
public uint f_p_memsz;
|
||||
public uint f_p_flags;
|
||||
public uint p_align;
|
||||
}
|
||||
|
||||
public class elf_64_phdr : Ielf_phdr<ulong>
|
||||
{
|
||||
public uint p_type => f_p_type;
|
||||
public ulong p_offset { get => f_p_offset; set => f_p_offset = value; }
|
||||
public ulong p_filesz { get => f_p_filesz; set => f_p_filesz = value; }
|
||||
public ulong p_memsz => f_p_memsz;
|
||||
public ulong p_vaddr { get => f_p_vaddr; set => f_p_vaddr = value; }
|
||||
public uint p_flags => f_p_flags;
|
||||
|
||||
public uint f_p_type;
|
||||
public uint f_p_flags;
|
||||
public ulong f_p_offset;
|
||||
public ulong f_p_vaddr;
|
||||
public ulong p_paddr;
|
||||
public ulong f_p_filesz;
|
||||
public ulong f_p_memsz;
|
||||
public ulong p_align;
|
||||
}
|
||||
|
||||
public class elf_shdr<TWord> where TWord : struct
|
||||
{
|
||||
public uint sh_name;
|
||||
public uint sh_type;
|
||||
public TWord sh_flags;
|
||||
public TWord sh_addr;
|
||||
public TWord sh_offset;
|
||||
public TWord sh_size;
|
||||
public uint sh_link;
|
||||
public uint sh_info;
|
||||
public TWord sh_addralign;
|
||||
public TWord sh_entsize;
|
||||
}
|
||||
|
||||
public interface Ielf_sym<TWord> where TWord : struct
|
||||
{
|
||||
uint st_name { get; }
|
||||
TWord st_value { get; }
|
||||
ushort st_shndx { get; }
|
||||
Elf st_info { get; }
|
||||
Elf type { get; }
|
||||
}
|
||||
|
||||
public class elf_32_sym : Ielf_sym<uint>
|
||||
{
|
||||
public uint st_name => f_st_name;
|
||||
public uint st_value => f_st_value;
|
||||
public ushort st_shndx => f_st_shndx;
|
||||
public Elf st_info => (Elf) f_st_info;
|
||||
public Elf type => (Elf) (f_st_info & 0xf);
|
||||
|
||||
public uint f_st_name;
|
||||
public uint f_st_value;
|
||||
public uint st_size;
|
||||
public byte f_st_info;
|
||||
public byte st_other;
|
||||
public ushort f_st_shndx;
|
||||
}
|
||||
|
||||
public class elf_64_sym : Ielf_sym<ulong>
|
||||
{
|
||||
public uint st_name => f_st_name;
|
||||
public ulong st_value => f_st_value;
|
||||
public ushort st_shndx => f_st_shndx;
|
||||
public Elf st_info => (Elf) f_st_info;
|
||||
public Elf type => (Elf) (f_st_info & 0xf);
|
||||
|
||||
public uint f_st_name;
|
||||
public byte f_st_info;
|
||||
public byte st_other;
|
||||
public ushort f_st_shndx;
|
||||
public ulong f_st_value;
|
||||
public ulong st_size;
|
||||
}
|
||||
|
||||
public class elf_dynamic<TWord> where TWord : struct
|
||||
{
|
||||
public TWord d_tag;
|
||||
public TWord d_un;
|
||||
}
|
||||
|
||||
public class elf_rel<TWord> where TWord : struct
|
||||
{
|
||||
public TWord r_offset;
|
||||
public TWord r_info;
|
||||
}
|
||||
|
||||
public class elf_rela<TWord> where TWord : struct
|
||||
{
|
||||
public TWord r_offset;
|
||||
public TWord r_info;
|
||||
public TWord r_addend;
|
||||
}
|
||||
#pragma warning restore CS0649
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user