530 lines
21 KiB
C++
530 lines
21 KiB
C++
/**************************** cof2asm.cpp ********************************
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* Author: Agner Fog
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* Date created: 2007-02-25
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* Last modified: 2009-12-20
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* Project: objconv
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* Module: cof2asm.cpp
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* Description:
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* Module for disassembling PE/COFF file
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*
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* Copyright 2007-2009 GNU General Public License http://www.gnu.org/licenses
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*****************************************************************************/
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#include "stdafx.h"
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CCOF2ASM::CCOF2ASM () {
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// Constructor
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}
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void CCOF2ASM::Convert() {
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// Do the conversion
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if (ImageBase) Disasm.Init(2, ImageBase); // Executable file or DLL. Set image base
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MakeSectionList(); // Make Sections list and Relocations list in Disasm
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MakeSymbolList(); // Make Symbols list in Disasm
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if (ImageBase) {
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// Executable file
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MakeDynamicRelocations(); // Make dynamic base relocations for executable files
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MakeImportList(); // Make imported symbols for executable files
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MakeExportList(); // Make exported symbols for executable files
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MakeListLabels(); // Put labels on all image directory tables
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}
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Disasm.Go(); // Disassemble
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*this << Disasm.OutFile; // Take over output file from Disasm
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}
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void CCOF2ASM::MakeSectionList() {
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// Make Sections list and Relocations list in Disasm
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uint32 isec; // Section index
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uint32 irel; // Relocation index
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// Loop through sections
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for (isec = 0; isec < (uint32)NSections; isec++) {
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// Get section header
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SCOFF_SectionHeader * SectionHeader = &SectionHeaders[isec];
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// Section properties
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const char * Name = GetSectionName(SectionHeader->Name);
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uint8 * Buffer = (uint8*)Buf() + SectionHeader->PRawData;
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uint32 InitSize = SectionHeader->SizeOfRawData;
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uint32 TotalSize = SectionHeader->VirtualSize;
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uint32 SectionAddress = SectionHeader->VirtualAddress;
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uint32 Type = (SectionHeader->Flags & PE_SCN_CNT_CODE) ? 1 : 2;
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if (SectionHeader->Flags & PE_SCN_CNT_UNINIT_DATA) {
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// BSS segment. No data in file
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Buffer = 0;
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Type = 3;
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}
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else if (!(SectionHeader->Flags & (PE_SCN_MEM_WRITE | PE_SCN_MEM_EXECUTE))) {
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// Constant segment
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Type = 4;
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}
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if (SectionHeader->Flags & PE_SCN_LNK_COMDAT) {
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// Communal section
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Type |= 0x1000;
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}
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if (strnicmp(Name,"debug",5) == 0 || strnicmp(Name+1,"debug",5) == 0) {
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// This is a debug section
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Type = 0x10;
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}
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if (strnicmp(Name,".pdata", 6) == 0) {
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// This section has exception information
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Type = 0x11;
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}
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uint32 Align = (SectionHeader->Flags & PE_SCN_ALIGN_MASK) / PE_SCN_ALIGN_1;
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if (Align) Align--;
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// Save section record
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Disasm.AddSection(Buffer, InitSize, TotalSize, SectionAddress, Type, Align, WordSize, Name);
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// Get relocations
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// Pointer to relocation entry
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union {
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SCOFF_Relocation * p; // pointer to record
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int8 * b; // used for address calculation and incrementing
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} Reloc;
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Reloc.b = Buf() + SectionHeader->PRelocations;
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for (irel = 0; irel < SectionHeader->NRelocations; irel++, Reloc.b += SIZE_SCOFF_Relocation) {
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// Relocation properties
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int32 Section = isec + 1;
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uint32 Offset = Reloc.p->VirtualAddress;
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int32 Addend = 0;
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uint32 TargetIndex = Reloc.p->SymbolTableIndex;
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// Translate relocation type
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uint32 Type = 0, Size = 0;
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if (WordSize == 32) {
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// 32 bit relocation types
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// 0 = unknown, 1 = direct, 2 = self-relative, 3 = image-relative, 4 = segment relative
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switch(Reloc.p->Type) {
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case COFF32_RELOC_ABS: // Ignore
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continue;
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case COFF32_RELOC_DIR32: // Direct, 32 bits
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Type = 1;
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Size = 4;
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break;
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case COFF32_RELOC_REL32: // Self-relative, 32 bits
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Type = 2;
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Size = 4;
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Addend = -4;
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break;
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case COFF32_RELOC_IMGREL: // Image relative, 32 bits
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Type = 4;
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Size = 4;
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break;
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case COFF32_RELOC_SECREL: // Section relative, 32 bits
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Type = 8;
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Size = 4;
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break;
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case COFF32_RELOC_SECTION: // Section index of symbol, 16 bits
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Type = 0x200;
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Size = 2;
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break;
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default: // Other/unknown
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Type = 0;
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Size = 4;
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}
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}
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else { // WordSize = 64
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switch(Reloc.p->Type) {
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case COFF64_RELOC_ABS: // Ignore
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continue;
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case COFF64_RELOC_ABS32: // Absolute 32 bit
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Type = 1;
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Size = 4;
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break;
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case COFF64_RELOC_ABS64: // Absolute 64 bit
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Type = 1;
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Size = 8;
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break;
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case COFF64_RELOC_IMGREL: // Image relative 32 bit
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Type = 4;
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Size = 4;
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break;
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case COFF64_RELOC_REL32: // Self-relative, 32 bits
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case COFF64_RELOC_REL32_1: // Self-relative + 1
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case COFF64_RELOC_REL32_2: // Self-relative + 2
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case COFF64_RELOC_REL32_3: // Self-relative + 3
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case COFF64_RELOC_REL32_4: // Self-relative + 4
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case COFF64_RELOC_REL32_5: // Self-relative + 5
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Type = 2;
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Size = 4;
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Addend = - (Reloc.p->Type + 4 - COFF64_RELOC_REL32);
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break;
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case COFF64_RELOC_SECREL: // Section relative
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Type = 8;
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Size = 4;
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break;
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default: // Other/unknown
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Type = 0;
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Size = 4;
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}
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}
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// Save relocation record
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Disasm.AddRelocation(Section, Offset, Addend, Type, Size, TargetIndex);
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}
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}
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}
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void CCOF2ASM::MakeSymbolList() {
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// Make Symbols list in Disasm
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uint32 isym; // Symbol index
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uint32 naux = 0; // Number of auxiliary entries in old symbol table
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union { // Pointer to old symbol table entries
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SCOFF_SymTableEntry * p; // Normal pointer
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int8 * b; // Used for address calculation
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} Sym, SymAux;
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// Set pointer to old SymbolTable
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Sym.p = SymbolTable;
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// Loop through old symbol table
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for (isym = 0; isym < (uint32)NumberOfSymbols; isym += 1+naux, Sym.b += (1+naux) * SIZE_SCOFF_SymTableEntry) {
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// Number of auxiliary entries
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naux = Sym.p->s.NumAuxSymbols;
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if (Sym.p->s.SectionNumber != COFF_SECTION_ABSOLUTE
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&& (Sym.p->s.SectionNumber < 0
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|| (Sym.p->s.StorageClass != COFF_CLASS_EXTERNAL && Sym.p->s.StorageClass != COFF_CLASS_STATIC && Sym.p->s.StorageClass != COFF_CLASS_LABEL))) {
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// Ignore irrelevant symbol table entries
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continue;
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}
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// Symbol properties
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uint32 Index = isym;
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int32 Section = Sym.p->s.SectionNumber;
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uint32 Offset = Sym.p->s.Value;
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uint32 Size = 0;
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uint32 Type = (Sym.p->s.Type == COFF_TYPE_FUNCTION) ? 0x83 : 0;
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// Identify segment entries in symbol table
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if (Sym.p->s.Value == 0 && Sym.p->s.StorageClass == COFF_CLASS_STATIC
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&& naux && Sym.p->s.Type != 0x20) {
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// Note: The official MS specification says that a symbol table entry
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// is a section if the storage class is static and the value is 0,
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// but I have encountered static functions that meet these criteria.
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// Therefore, I am also checking Type and naux.
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Type = 0x80000082;
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}
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const char * Name = GetSymbolName(Sym.p->s.Name);
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// Get scope. Note that these values are different from the constants defined in maindef.h
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uint32 Scope = 0;
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if (Sym.p->s.StorageClass == COFF_CLASS_STATIC || Sym.p->s.StorageClass == COFF_CLASS_LABEL) {
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Scope = 2; // Local
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}
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else if (Sym.p->s.SectionNumber > 0 || (Sym.p->s.SectionNumber == -1 && Sym.p->s.StorageClass == COFF_CLASS_EXTERNAL)) {
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Scope = 4; // Public
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}
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else {
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Scope = 0x20; // External
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}
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// Check auxiliary symbol table entries
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if (naux && Sym.p->s.Type == COFF_TYPE_FUNCTION) {
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// Function symbol has auxiliary entry. Get information about size
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SymAux.b = Sym.b + SIZE_SCOFF_SymTableEntry;
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Size = SymAux.p->func.TotalSize;
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}
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// Check for special section values
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if (Section < 0) {
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if (Section == COFF_SECTION_ABSOLUTE) {
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// Symbol is an absolute constant
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Section = ASM_SEGMENT_ABSOLUTE;
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}
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else {
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// Debug symbols, etc
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Section = ASM_SEGMENT_ERROR;
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}
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}
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// Store new symbol record
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Disasm.AddSymbol(Section, Offset, Size, Type, Scope, Index, Name);
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}
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}
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void CCOF2ASM::MakeDynamicRelocations() {
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// Make dynamic base relocations for executable files
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// Find base relocation table
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SCOFF_ImageDirAddress reldir;
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if (!GetImageDir(5, &reldir)) {
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// No base relocation table found
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return;
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}
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SCOFF_BaseRelocationBlock * pBaseRelocation; // Start of dynamic base relocation section
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// Beginning of .reloc section is first base relocation block
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pBaseRelocation = &Get<SCOFF_BaseRelocationBlock>(reldir.FileOffset);
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uint32 ROffset = 0; // Offset into .reloc section
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uint32 BlockEnd; // Offset of end of current block
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uint32 PageOffset; // Image-relative address of begin of page
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// Make pointer to header or entry in .reloc section
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union {
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SCOFF_BaseRelocationBlock * header;
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SCOFF_BaseRelocation * entry;
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int8 * b;
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} Pointer;
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// Loop throung .reloc section
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// while (ROffset < reldir.MaxOffset) {
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while (ROffset < reldir.Size) {
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// Set Pointer to current position
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Pointer.header = pBaseRelocation;
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Pointer.b += ROffset;
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// Read base relocation block
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PageOffset = Pointer.header->PageRVA;
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BlockEnd = ROffset + Pointer.header->BlockSize;
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// Read entries in this block
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ROffset += sizeof(SCOFF_BaseRelocationBlock);
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Pointer.b += sizeof(SCOFF_BaseRelocationBlock);
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// Loop through entries
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while (ROffset < BlockEnd) {
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// Set Pointer to current position
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Pointer.header = pBaseRelocation;
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Pointer.b += ROffset;
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if (Pointer.entry->Type == COFF_REL_BASED_HIGHLOW) {
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// Add relocation record, 32 bit
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// Section = ASM_SEGMENT_IMGREL means offset is image-relative
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// Type = 0x20 means already relocated to image base
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Disasm.AddRelocation(ASM_SEGMENT_IMGREL, Pointer.entry->Offset + PageOffset, 0, 0x21, 4, 0);
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}
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else if (Pointer.entry->Type == COFF_REL_BASED_DIR64) {
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// Add relocation record, 64 bit
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Disasm.AddRelocation(ASM_SEGMENT_IMGREL, Pointer.entry->Offset + PageOffset, 0, 0x21, 8, 0);
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}
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// Go to next
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ROffset += sizeof(SCOFF_BaseRelocation);
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if (Pointer.entry->Type == COFF_REL_BASED_HIGHADJ) ROffset += sizeof(SCOFF_BaseRelocation);
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}
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// Finished block. Align by 4
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ROffset = (ROffset + 3) & uint32(-4);
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}
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}
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void CCOF2ASM::MakeImportList() {
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// Make imported symbols for executable files
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// Find import table
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SCOFF_ImageDirAddress impdir;
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if (!GetImageDir(1, &impdir)) {
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// No import table found
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return;
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}
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// Beginning of import section is import directory
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SCOFF_ImportDirectory * pImportDirectory = &Get<SCOFF_ImportDirectory>(impdir.FileOffset);
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// Check if 64 bit
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int Is64bit = OptionalHeader->h64.Magic == COFF_Magic_PE64; // 1 if 64 bit
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uint32 EntrySize = Is64bit ? 8 : 4; // Size of address table entries
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uint32 NameOffset; // Offset to name
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const char * SymbolName; // Name of symbol
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const char * DLLName; // Name of DLL containing symbol
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char NameBuffer[64]; // Buffer for creating name of ordinal symbols
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uint32 SectionOffset; // Section-relative address of current entry
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uint32 HintNameOffset; // Section-relative address of hint/name table
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uint32 FirstHintNameOffset = 0; // First HintNameOffset = start of hint/name table
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uint32 AddressTableOffset; // Offset of import address table relative to import lookup table
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// Pointer to current import directory entry
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SCOFF_ImportDirectory * ImportEntry = pImportDirectory;
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// Pointer to current import lookup table entry
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int32 * LookupEntry = 0;
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// Pointer to current hint/name table entry
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SCOFF_ImportHintName * HintNameEntry;
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// Loop through import directory until null entry
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while (ImportEntry->DLLNameRVA) {
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// Get DLL name
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NameOffset = ImportEntry->DLLNameRVA - impdir.VirtualAddress;
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if (NameOffset < impdir.MaxOffset) {
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DLLName = &Get<char>(impdir.FileOffset + NameOffset);
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}
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else {
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DLLName = "?";
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}
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// Get lookup table
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SectionOffset = ImportEntry->ImportLookupTableRVA;
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if (SectionOffset == 0) SectionOffset = ImportEntry->ImportAddressTableRVA;
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if (SectionOffset == 0) continue;
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// Get distance from import lookup table to import address table
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AddressTableOffset = ImportEntry->ImportAddressTableRVA - SectionOffset;
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// Section relative address
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SectionOffset -= impdir.VirtualAddress;
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if (SectionOffset >= impdir.MaxOffset) break; // Out of range
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// Loop through lookup table
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while (1) {
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// Pointer to lookup table entry
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LookupEntry = &Get<int32>(impdir.FileOffset + SectionOffset);
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// End when entry is empty
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if (!LookupEntry[0]) break;
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if (LookupEntry[Is64bit] < 0) {
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// Imported by ordinal. Give it a name
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strncpy(NameBuffer, DLLName, 20);
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// Remove dot from name
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char * dot = strchr(NameBuffer,'.');
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if (dot) *dot = 0;
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// Add ordinal number to name
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sprintf(NameBuffer+strlen(NameBuffer), "_Ordinal_%i", uint16(LookupEntry[0]));
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SymbolName = NameBuffer;
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}
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else {
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// Find entry in hint/name table
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HintNameOffset = (LookupEntry[0] & 0x7FFFFFFF) - impdir.VirtualAddress;
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if (HintNameOffset >= impdir.MaxOffset) goto LOOPNEXT; // Out of range
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if (!FirstHintNameOffset) FirstHintNameOffset = HintNameOffset;
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HintNameEntry = &Get<SCOFF_ImportHintName>(impdir.FileOffset + HintNameOffset);
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// Get name
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SymbolName = HintNameEntry->Name;
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}
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// Add symbol
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Disasm.AddSymbol(ASM_SEGMENT_IMGREL, impdir.VirtualAddress + SectionOffset + AddressTableOffset,
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EntrySize, 0xC, 0x20, 0, SymbolName, DLLName);
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// Loop next
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LOOPNEXT:
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SectionOffset += EntrySize;
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}
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// Loop next
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ImportEntry++;
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}
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// Make label for import name table
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if (FirstHintNameOffset) {
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Disasm.AddSymbol(ASM_SEGMENT_IMGREL, impdir.VirtualAddress + FirstHintNameOffset, 1, 1, 1, 0, "Import_name_table");
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}
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}
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void CCOF2ASM::MakeExportList() {
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// Make exported symbols for executable files
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// Define entry point
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if (OptionalHeader->h32.AddressOfEntryPoint) {
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Disasm.AddSymbol(ASM_SEGMENT_IMGREL, OptionalHeader->h32.AddressOfEntryPoint, 0, 0x83, 4, 0, "Entry_point");
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}
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// Get export table directory address
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SCOFF_ImageDirAddress expdir;
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// Exported names
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if (!GetImageDir(0, &expdir)) {
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// No export directory
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return;
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}
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// Beginning of export section is export directory
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SCOFF_ExportDirectory * pExportDirectory = &Get<SCOFF_ExportDirectory>(expdir.FileOffset);
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// Find ExportAddressTable
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uint32 ExportAddressTableOffset = pExportDirectory->ExportAddressTableRVA - expdir.VirtualAddress;
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if (ExportAddressTableOffset == 0 || ExportAddressTableOffset >= expdir.MaxOffset) {
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// Points outside section
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err.submit(2035); return;
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}
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uint32 * pExportAddressTable = &Get<uint32>(expdir.FileOffset + ExportAddressTableOffset);
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// Find ExportNameTable
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if (pExportDirectory->NamePointerTableRVA == 0) {
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return; // I don't know why this happens
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}
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uint32 ExportNameTableOffset = pExportDirectory->NamePointerTableRVA - expdir.VirtualAddress;
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if (ExportNameTableOffset == 0 || ExportNameTableOffset >= expdir.MaxOffset) {
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// Points outside section
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err.submit(2035); return;
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}
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uint32 * pExportNameTable = &Get<uint32>(expdir.FileOffset + ExportNameTableOffset);
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// Find ExportOrdinalTable
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uint32 ExportOrdinalTableOffset = pExportDirectory->OrdinalTableRVA - expdir.VirtualAddress;
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if (ExportOrdinalTableOffset == 0 || ExportOrdinalTableOffset >= expdir.MaxOffset) {
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// Points outside section
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err.submit(2035); return;
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}
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uint16 * pExportOrdinalTable = &Get<uint16>(expdir.FileOffset + ExportOrdinalTableOffset);
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// Get further properties
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uint32 NumExports = pExportDirectory->AddressTableEntries;
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uint32 NumExportNames = pExportDirectory->NamePointerEntries;
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uint32 OrdinalBase = pExportDirectory->OrdinalBase;
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uint32 i; // Index into pExportOrdinalTable and pExportNameTable
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uint32 Ordinal; // Index into pExportAddressTable
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uint32 Address; // Image-relative address of symbol
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uint32 NameOffset; // Section-relative address of name
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uint32 FirstName = 0; // Image-relative address of first name table entry
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const char * Name = 0; // Name of symbol
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char NameBuffer[64]; // Buffer for making name
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// Loop through export tables
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for (i = 0; i < NumExports; i++) {
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Address = 0;
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Name = "?";
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// Get ordinal from table
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Ordinal = pExportOrdinalTable[i];
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// Address table is indexed by ordinal
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if (Ordinal < NumExports) {
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Address = pExportAddressTable[Ordinal];
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}
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// Find name if there is a name list entry
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if (i < NumExportNames) {
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NameOffset = pExportNameTable[i] - expdir.VirtualAddress;
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if (NameOffset && NameOffset < expdir.MaxOffset) {
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Name = &Get<char>(expdir.FileOffset + NameOffset);
|
|
if (FirstName == 0) FirstName = pExportNameTable[i];
|
|
}
|
|
}
|
|
else {
|
|
// No name. Make name from ordinal number
|
|
sprintf(NameBuffer, "Ordinal_%i", Ordinal + OrdinalBase);
|
|
Name = NameBuffer;
|
|
}
|
|
|
|
// Define symbol
|
|
Disasm.AddSymbol(ASM_SEGMENT_IMGREL, Address, 0, 0x83, 4, 0, Name);
|
|
}
|
|
|
|
// Make label for export section
|
|
Disasm.AddSymbol(ASM_SEGMENT_IMGREL, expdir.VirtualAddress, 4, 3, 2, 0, "Export_tables");
|
|
|
|
// Make labels for export tables
|
|
Disasm.AddSymbol(ASM_SEGMENT_IMGREL, ExportAddressTableOffset - expdir.FileOffset + expdir.VirtualAddress, 4, 3, 2, 0, "Export_address_table");
|
|
Disasm.AddSymbol(ASM_SEGMENT_IMGREL, ExportOrdinalTableOffset - expdir.FileOffset + expdir.VirtualAddress, 4, 3, 2, 0, "Export_ordinal_table");
|
|
Disasm.AddSymbol(ASM_SEGMENT_IMGREL, ExportNameTableOffset - expdir.FileOffset + expdir.VirtualAddress, 4, 3, 2, 0, "Export_name_pointer_table");
|
|
Disasm.AddSymbol(ASM_SEGMENT_IMGREL, FirstName, 1, 1, 2, 0, "Export_name_table");
|
|
}
|
|
|
|
void CCOF2ASM::MakeListLabels() {
|
|
// Attach names to all image directories
|
|
SCOFF_ImageDirAddress dir;
|
|
uint32 i;
|
|
|
|
for (i = 0; i < NumImageDirs; i++) {
|
|
if (GetImageDir(i, &dir)) {
|
|
// Found a directory. Make label for it
|
|
Disasm.AddSymbol(ASM_SEGMENT_IMGREL, dir.VirtualAddress, 4, 0, 1, 0, dir.Name);
|
|
}
|
|
}
|
|
}
|