e32tools/elf2e32/source/imgdump.cpp
changeset 0 044383f39525
child 590 360bd6b35136
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/e32tools/elf2e32/source/imgdump.cpp	Tue Oct 27 16:36:35 2009 +0000
@@ -0,0 +1,735 @@
+// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// Implementation of the e32 image dump for the elf2e32 tool
+// @internalComponent
+// @released
+// 
+//
+
+#define __REFERENCE_CAPABILITY_NAMES__
+
+#include "e32imagefile.h"
+#include "pl_common.h"
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+#ifdef __LINUX__ 
+    #define VSNPRINTF vsnprintf
+#else 
+    #define VSNPRINTF _vsnprintf
+#endif 
+
+using std::cout;
+
+const TInt KMaxStringLength=0x400;
+
+/**
+Variadic Function to print string.
+
+@internalComponent
+@released
+
+@param aFmt
+Formatted string.
+*/
+void PrintString(const char *aFmt,...)
+{
+	TText imageText[KMaxStringLength];
+	va_list list;
+	va_start(list,aFmt);
+	VSNPRINTF((char *)imageText,KMaxStringLength,aFmt,list);
+	va_end(list);
+	cout << imageText;
+
+	cout.flush();
+}
+
+/**
+Function to set priority.
+
+@internalComponent
+@released
+
+@param aPri
+Priority Type passed in
+@param aStr
+The priority value corresponding to the appropriate priority type
+*/
+void PriorityToStr(TProcessPriority aPri, char *aStr)
+{
+	if (aPri==EPrioritySupervisor)
+		strcpy(aStr,"Supervisor");
+
+	else if (aPri>EPriorityRealTimeServer)
+		sprintf(aStr, "RealTime+%d", aPri-EPriorityRealTimeServer);
+	else if (aPri==EPriorityRealTimeServer)
+		strcpy(aStr,"RealTime");
+
+	else if (aPri>EPriorityFileServer)
+		sprintf(aStr, "FileServer+%d", aPri-EPriorityFileServer);
+	else if (aPri==EPriorityFileServer)
+		strcpy(aStr,"FileServer");
+
+	else if (aPri>EPriorityWindowServer)
+		sprintf(aStr, "WindowServer+%d", aPri-EPriorityWindowServer);
+	else if (aPri==EPriorityWindowServer)
+		strcpy(aStr,"WindowServer");
+
+	else if (aPri>EPriorityHigh)
+		sprintf(aStr, "High+%d", aPri-EPriorityHigh);
+	else if (aPri==EPriorityHigh)
+		strcpy(aStr,"High");
+
+	else if (aPri>EPriorityForeground)
+		sprintf(aStr, "Foreground+%d", aPri-EPriorityForeground);
+	else if (aPri==EPriorityForeground)
+		strcpy(aStr,"Foreground");
+
+	else if (aPri>EPriorityBackground)
+		sprintf(aStr, "Background+%d", aPri-EPriorityBackground);
+	else if (aPri==EPriorityBackground)
+		strcpy(aStr,"Background");
+
+	else if (aPri>EPriorityLow)
+		sprintf(aStr, "Low+%d", aPri-EPriorityLow);
+	else if (aPri==EPriorityLow)
+		strcpy(aStr,"Low");
+
+	else
+		sprintf(aStr, "Illegal (%d)", aPri);
+}
+
+/**
+Function to dump e32 image.
+
+@internalComponent
+@released
+
+@param aFileName
+Name of the E32image to be dumped.
+@param aDumpFlags
+sub options passed to the 'dump' option
+*/
+void E32ImageFile::Dump(TText *aFileName,TInt aDumpFlags)
+{
+	PrintString("E32ImageFile '%s'\n", aFileName);
+	DumpHeader(aDumpFlags);
+	DumpData(aDumpFlags);
+}
+
+/**
+Function to dump e32 image header.
+
+@internalComponent
+@released
+
+@param aDumpFlags
+The flags set based on the sub options provided to the program.
+*/
+void E32ImageFile::DumpHeader(TInt aDumpFlags)
+{
+	TUint flags = iOrigHdr->iFlags;
+	TUint abi = E32ImageHeader::ABIFromFlags(flags);
+	TUint hdrfmt = E32ImageHeader::HdrFmtFromFlags(flags);
+	TUint impfmt = E32ImageHeader::ImpFmtFromFlags(flags);
+	TUint ept = E32ImageHeader::EptFromFlags(flags);
+	TBool isARM = EFalse;
+
+	if(aDumpFlags&EDumpHeader)
+	{
+		PrintString("V%d.%02d(%03d)", iOrigHdr->iToolsVersion.iMajor,iOrigHdr->iToolsVersion.iMinor,iOrigHdr->iToolsVersion.iBuild);
+		PrintString("\tTime Stamp: %08x,%08x\n", iOrigHdr->iTimeHi, iOrigHdr->iTimeLo);
+		char sig[5];
+		memcpy(sig, (const char*)&iOrigHdr->iSignature, 4);
+		sig[4]=0;
+		PrintString(sig);
+		if (iOrigHdr->iFlags&KImageDll)
+			PrintString(" Dll for ");
+		else
+			PrintString(" Exe for ");
+		switch (iOrigHdr->CpuIdentifier())
+		{
+		case ECpuX86:
+			PrintString("X86 CPU\n");
+			break;
+		case ECpuArmV4:
+			isARM = ETrue;
+			PrintString("ARMV4 CPU\n");
+			break;
+		case ECpuArmV5:
+			isARM = ETrue;
+			PrintString("ARMV5 CPU\n");
+			break;
+		case ECpuMCore:
+			PrintString("M*Core CPU\n");
+			break;
+		case ECpuUnknown:
+			PrintString("Unknown CPU\n");
+			break;
+		default:
+			PrintString("something or other\n");
+			break;
+		}
+		
+		PrintString("Flags:\t%08x\n", flags);
+
+		if (!(flags & KImageDll))
+		{
+			char str[80];
+			PriorityToStr(iOrigHdr->ProcessPriority(), str);
+			PrintString("Priority %s\n", str);
+			if (flags & KImageFixedAddressExe)
+				PrintString("Fixed process\n");
+		}
+		
+		if (flags & KImageNoCallEntryPoint)
+			PrintString("Entry points are not called\n");
+		
+		PrintString("Image header is format %d\n", hdrfmt>>24);
+		TUint compression = iOrigHdr->CompressionType();
+		
+		switch (compression)
+		{
+		case KFormatNotCompressed:
+			PrintString("Image is not compressed\n");
+			break;
+		case KUidCompressionDeflate:
+			PrintString("Image is compressed using the DEFLATE algorithm\n");
+			break;
+		case KUidCompressionBytePair:
+			PrintString("Image is compressed using the BYTEPAIR algorithm\n");
+			break;
+		default:
+			PrintString("Image compression type UNKNOWN (%08x)\n", compression);
+		}
+		
+		if (compression)
+		{
+			PrintString("Uncompressed size %08x\n", iOrigHdr->UncompressedFileSize());
+		}
+
+		TUint FPU = flags & KImageHWFloatMask;
+
+		if (FPU == KImageHWFloat_None)
+			PrintString("Image FPU support : Soft VFP\n");
+		else if (FPU == KImageHWFloat_VFPv2) 
+			PrintString("Image FPU support : VFPv2\n");
+		else
+			PrintString("Image FPU support : Unknown\n");
+
+		// Code paging.
+
+		if (flags & KImageCodeUnpaged)
+		{
+			PrintString("Code Paging : Unpaged\n");
+		}
+		else if (flags & KImageCodePaged)
+		{
+			PrintString("Code Paging : Paged\n");
+		}
+		else
+		{
+			PrintString("Code Paging : Default\n");
+		}
+
+		// Data paging.
+
+		if (flags & KImageDataUnpaged)
+		{
+			PrintString("Data Paging : Unpaged\n");
+		}
+		else if (flags & KImageDataPaged)
+		{
+			PrintString("Data Paging : Paged\n");
+		}
+		else
+		{
+			PrintString("Data Paging : Default\n");
+		}
+
+		if (iOrigHdr->iFlags & KImageDebuggable)
+		{
+			PrintString("Debuggable : True\n");
+		}
+		else
+		{
+			PrintString("Debuggable : False\n");
+		}
+		if (iOrigHdr->iFlags & KImageSMPSafe)
+		{
+			PrintString("SMP Safe : True\n");
+		}
+		else
+		{
+			PrintString("SMP Safe : False\n");
+		}
+	}
+
+	if (hdrfmt >= KImageHdrFmt_V && (aDumpFlags&(EDumpHeader|EDumpSecurityInfo)))
+	{
+		//
+		// Important. Don't change output format of following security info
+		// because this is relied on by used by "Symbian Signed".
+		//
+		E32ImageHeaderV* v = iHdr;
+		PrintString("Secure ID: %08x\n", v->iS.iSecureId);
+		PrintString("Vendor ID: %08x\n", v->iS.iVendorId);
+		PrintString("Capabilities: %08x %08x\n", v->iS.iCaps[1], v->iS.iCaps[0]);
+		if(aDumpFlags&EDumpSecurityInfo)
+		{
+			TInt i;
+			for(i=0; i<ECapability_Limit; i++)
+				if(v->iS.iCaps[i>>5]&(1<<(i&31)))
+					PrintString("              %s\n", CapabilityNames[i]);
+			PrintString("\n");
+		}
+	}
+
+	if(aDumpFlags&EDumpHeader)
+	{
+		if (hdrfmt >= KImageHdrFmt_V)
+		{
+			E32ImageHeaderV* v = iHdr;
+			TUint32 xd = v->iExceptionDescriptor;
+			if ((xd & 1) && (xd != 0xffffffffu))
+			{
+				xd &= ~1;
+				PrintString("Exception Descriptor Offset:  %08x\n", v->iExceptionDescriptor);
+				TExceptionDescriptor * aED = (TExceptionDescriptor * )(iData + v->iCodeOffset + xd);
+				PrintString("Exception Index Table Base: %08x\n", aED->iExIdxBase);
+				PrintString("Exception Index Table Limit: %08x\n", aED->iExIdxLimit);
+				PrintString("RO Segment Base: %08x\n", aED->iROSegmentBase);
+				PrintString("RO Segment Limit: %08x\n", aED->iROSegmentLimit);
+			}
+			else
+				PrintString("No Exception Descriptor\n");
+
+			PrintString("Export Description: Size=%03x, Type=%02x\n", v->iExportDescSize, v->iExportDescType);
+			
+			if (v->iExportDescType != KImageHdr_ExpD_NoHoles)
+			{
+				TInt nb = v->iExportDescSize;
+				TInt i;
+				TInt j = 0;
+				for (i=0; i<nb; ++i)
+				{
+					if (++j == 8)
+					{
+						j = 0;
+						PrintString("\n");
+					}
+					PrintString(" %02x", v->iExportDesc[i]);
+				}
+				PrintString("\n");
+			}
+			
+			TInt r = CheckExportDescription();
+			
+			if (r == KErrNone)
+				PrintString("Export description consistent\n");
+			else if (r == KErrNotSupported)
+				PrintString("Export description type not recognised\n");
+			else
+				PrintString("!! Export description inconsistent !!\n");
+		}
+
+		TUint32 mv = iOrigHdr->ModuleVersion();
+		PrintString("Module Version: %d.%d\n", mv>>16, mv&0xffff);
+		
+		if (impfmt == KImageImpFmt_PE)
+		{
+			PrintString("Imports are PE-style\n");
+		}
+		else if (impfmt == KImageImpFmt_ELF)
+		{
+			PrintString("Imports are ELF-style\n");
+		}
+		else if (impfmt == KImageImpFmt_PE2)
+		{
+			PrintString("Imports are PE-style without redundant ordinal lists\n");
+		}
+		
+		if (isARM)
+		{
+			if (abi == KImageABI_GCC98r2)
+			{
+				PrintString("GCC98r2 ABI\n");
+			}
+			else if (abi == KImageABI_EABI)
+			{
+				PrintString("ARM EABI\n");
+			}
+			if (ept == KImageEpt_Eka1)
+			{
+				PrintString("Built against EKA1\n");
+			}
+			else if (ept == KImageEpt_Eka2)
+			{
+				PrintString("Built against EKA2\n");
+			}
+		}
+
+		PrintString("Uids:\t\t%08x %08x %08x (%08x)\n", iOrigHdr->iUid1, iOrigHdr->iUid2, iOrigHdr->iUid3, iOrigHdr->iUidChecksum);
+		
+		if (hdrfmt >= KImageHdrFmt_V)
+			PrintString("Header CRC:\t%08x\n", iHdr->iHeaderCrc);
+		
+		PrintString("File Size:\t%08x\n", iSize);
+		PrintString("Code Size:\t%08x\n", iOrigHdr->iCodeSize);
+		PrintString("Data Size:\t%08x\n", iOrigHdr->iDataSize);
+		PrintString("Compression:\t%08x\n", iOrigHdr->iCompressionType);
+		PrintString("Min Heap Size:\t%08x\n", iOrigHdr->iHeapSizeMin);
+		PrintString("Max Heap Size:\t%08x\n", iOrigHdr->iHeapSizeMax);
+		PrintString("Stack Size:\t%08x\n", iOrigHdr->iStackSize);
+		PrintString("Code link addr:\t%08x\n", iOrigHdr->iCodeBase);
+		PrintString("Data link addr:\t%08x\n", iOrigHdr->iDataBase);
+		PrintString("Code reloc offset:\t%08x\n", OrigCodeRelocOffset());
+		PrintString("Data reloc offset:\t%08x\n", OrigDataRelocOffset());
+		PrintString("Dll ref table count: %d\n", iOrigHdr->iDllRefTableCount);
+
+		if (iOrigHdr->iCodeSize || iOrigHdr->iDataSize || iOrigHdr->iBssSize || iOrigHdr->iImportOffset)
+			PrintString("        Offset  Size  Relocs #Relocs\n");
+
+		PrintString("Code    %06x %06x", OrigCodeOffset(), iOrigHdr->iCodeSize);
+		
+		if (iOrigHdr->iCodeRelocOffset)
+		{
+			E32RelocSection *r=(E32RelocSection *)(iData + iOrigHdr->iCodeRelocOffset);
+			PrintString(" %06x %06x", OrigCodeRelocOffset(), r->iNumberOfRelocs);
+		}
+		else
+			PrintString("              ");
+		
+		PrintString("        +%06x (entry pnt)", iOrigHdr->iEntryPoint);
+		PrintString("\n");
+
+		PrintString("Data    %06x %06x", OrigDataOffset(), iOrigHdr->iDataSize);
+		
+		if (iOrigHdr->iDataRelocOffset)
+		{
+			E32RelocSection *r=(E32RelocSection *)(iData + iOrigHdr->iDataRelocOffset);
+			PrintString(" %06x %06x", OrigDataRelocOffset(), r->iNumberOfRelocs);
+		}
+		PrintString("\n");
+
+		PrintString("Bss            %06x\n", iOrigHdr->iBssSize);
+
+		if (iOrigHdr->iExportDirOffset)
+			PrintString("Export  %06x %06x                      (%d entries)\n", OrigExportDirOffset(), iOrigHdr->iExportDirCount*4, iOrigHdr->iExportDirCount);
+		
+		if (iOrigHdr->iImportOffset)
+			PrintString("Import  %06x\n", OrigImportOffset());
+	}
+}
+
+/**
+Function to dump e32 image.
+
+@internalComponent
+@released
+
+@param aData
+Data to be dumped
+@param aLength
+Length of the file
+*/
+void dump(TUint *aData, TInt aLength)
+{
+	TUint *p=aData;
+	TInt i=0;
+	char line[256];
+	char *cp=(char*)aData;
+	TInt j=0;
+	memset(line,' ',sizeof(line));
+	while (i<aLength)
+	{
+		TInt ccount=0;
+		char* linep=&line[8*9+2];
+		PrintString("%06x:", i);
+		while (i<aLength && ccount<8)
+		{
+			PrintString(" %08x", *p++);
+			i+=4;
+			ccount++;
+			for (j=0; j<4; j++)
+			{
+				char c=*cp++;
+				if (c<32 || c>127)
+				{
+					c = '.';
+				}
+				*linep++ = c;
+			}
+		}
+		*linep='\0';
+		PrintString("%s", line+(ccount*9));
+		PrintString("\n");
+	}
+}
+
+/**
+Function to dump relocations.
+
+@internalComponent
+@released
+
+@param aRelocs
+Character pointer to relocations.
+*/
+void dumprelocs(char *aRelocs)
+{
+
+	TInt num=((E32RelocSection *)aRelocs)->iNumberOfRelocs;
+	PrintString("%d relocs\n", num);
+	aRelocs+=sizeof(E32RelocSection);
+	TInt printed=0;
+	while (num>0)
+	{
+		TInt page=*(TUint *)aRelocs;
+		TInt size=*(TUint *)(aRelocs+4);
+		TInt pagesize=size;
+		size-=8;
+		TUint16 *p=(TUint16 *)(aRelocs+8);
+		while (size>0)
+		{
+			TUint a=*p++;
+			TUint relocType = (a & 0x3000) >> 12;
+			if ((relocType == 1) || (relocType == 3)) //only relocation type1 and type3
+			{
+				PrintString("%08x(%d) ", page + (a&0x0fff), relocType);
+				printed++;
+				if (printed>3)
+				{
+					PrintString("\n");
+					printed=0;
+				}
+			}
+			size-=2;
+			num--;
+		}
+		aRelocs+=pagesize;
+	}
+	PrintString("\n");
+}
+
+/**
+Function to dump e32 image data.
+
+@internalComponent
+@released
+
+@param aDumpFlags
+The flags set based on the sub options provided to the program.
+*/
+void E32ImageFile::DumpData(TInt aDumpFlags)
+{
+	if(aDumpFlags&EDumpCode)
+	{
+		PrintString("\nCode (text size=%08x)\n", iOrigHdr->iTextSize);
+		dump((TUint *)(iData + iOrigHdr->iCodeOffset), iOrigHdr->iCodeSize);
+	
+		if (iOrigHdr->iCodeRelocOffset)
+			dumprelocs(iData + iOrigHdr->iCodeRelocOffset);
+	}
+
+	if((aDumpFlags&EDumpData) && iOrigHdr->iDataOffset)
+	{
+		PrintString("\nData\n");
+		dump((TUint *)(iData + iOrigHdr->iDataOffset), iOrigHdr->iDataSize);
+	
+		if (iOrigHdr->iDataRelocOffset)
+			dumprelocs(iData + iOrigHdr->iDataRelocOffset);
+	}
+
+	if(aDumpFlags&EDumpExports)
+	{
+		PrintString("\nNumber of exports = %d\n", iOrigHdr->iExportDirCount);
+		TInt i;
+		TUint* exports = (TUint*)(iData + iOrigHdr->iExportDirOffset);
+		TUint absoluteEntryPoint = iOrigHdr->iEntryPoint + iOrigHdr->iCodeBase;
+		TUint impfmt = iOrigHdr->ImportFormat();
+		TUint absentVal = (impfmt == KImageImpFmt_ELF) ? absoluteEntryPoint : iOrigHdr->iEntryPoint;
+		for (i=0; i<iOrigHdr->iExportDirCount; ++i)
+		{
+			TUint exp = exports[i];
+			if (exp == absentVal)
+				PrintString("\tOrdinal %5d:\tABSENT\n", i+1);
+			else
+				PrintString("\tOrdinal %5d:\t%08x\n", i+1, exp);
+		}
+	}
+
+	// Important. Don't change output format of following inport info
+	// because this is relied on by tools used by "Symbian Signed".
+	if((aDumpFlags&EDumpImports) && iOrigHdr->iImportOffset)
+	{
+		const E32ImportSection* isection = (const E32ImportSection*)(iData + iOrigHdr->iImportOffset);
+		TUint* iat = (TUint*)((TUint8*)iData + iOrigHdr->iCodeOffset + iOrigHdr->iTextSize);
+		PrintString("\nIdata\tSize=%08x\n", isection->iSize);
+		PrintString("Offset of import address table (relative to code section): %08x\n", iOrigHdr->iTextSize);
+		TInt d;
+		const E32ImportBlock* b = (const E32ImportBlock*)(isection + 1);
+		for (d=0; d<iOrigHdr->iDllRefTableCount; d++)
+		{
+			char* dllname = iData + iOrigHdr->iImportOffset + b->iOffsetOfDllName;
+			TInt n = b->iNumberOfImports;
+			PrintString("%d imports from %s\n", b->iNumberOfImports, dllname);
+			const TUint* p = b->Imports();
+			TUint impfmt = iOrigHdr->ImportFormat();
+			if (impfmt == KImageImpFmt_ELF)
+			{
+				while (n--)
+				{
+					TUint impd_offset = *p++;
+					TUint impd = *(TUint*)(iData + iOrigHdr->iCodeOffset + impd_offset);
+					TUint ordinal = impd & 0xffff;
+					TUint offset = impd >> 16;
+				
+					if (offset)
+						PrintString("%10d offset by %d\n", ordinal, offset);
+					else
+						PrintString("%10d\n", ordinal);
+				}
+			}
+			else
+			{
+				while (n--)
+					PrintString("\t%d\n", *iat++);
+			}
+			b = b->NextBlock(impfmt);
+		}
+	}
+	if((aDumpFlags & EDumpSymbols) && (iOrigHdr->iFlags & KImageNmdExpData))
+	{
+		TUint* aExpTbl = (TUint*)(iData + iOrigHdr->iExportDirOffset);
+		TUint* aZeroethOrd = aExpTbl - 1;
+
+		E32EpocExpSymInfoHdr *aSymInfoHdr = (E32EpocExpSymInfoHdr*)(iData + \
+					iOrigHdr->iCodeOffset + \
+					*aZeroethOrd - iOrigHdr->iCodeBase ) ;
+		DumpSymbolInfo(aSymInfoHdr);
+	}
+}
+
+void E32ImageFile::DumpSymbolInfo(E32EpocExpSymInfoHdr *aSymInfoHdr)
+{
+	if(!aSymInfoHdr)
+		return;
+	char	*aSymTblBase = (char*)aSymInfoHdr;
+	TUint	*aSymAddrTbl;
+	char	*aSymNameTbl;
+
+	char *aStrTable = aSymTblBase + aSymInfoHdr->iStringTableOffset;
+	aSymAddrTbl = (TUint*)(aSymTblBase + aSymInfoHdr->iSymbolTblOffset);
+	aSymNameTbl = (char*)(aSymAddrTbl + aSymInfoHdr->iSymCount);
+	
+	int aIdx;
+	char *aSymName;
+
+	PrintString("\n\n\t\tSymbol Info\n");
+	if(aSymInfoHdr->iSymCount)
+	{
+		PrintString("0x%x Symbols exported\n",aSymInfoHdr->iSymCount);
+		PrintString("  Addr\t\tName\n");
+		PrintString("----------------------------------------\n");
+		TUint aNameOffset = 0;
+		for(aIdx=0;aIdx<aSymInfoHdr->iSymCount ; aIdx++)
+		{
+			if(aSymInfoHdr->iFlags & 1)
+			{
+				TUint32* aOff = ((TUint32*)aSymNameTbl+aIdx);
+				aNameOffset = (*aOff) << 2;
+				aSymName = aStrTable + aNameOffset;
+			}
+			else
+			{
+				TUint16* aOff = ((TUint16*)aSymNameTbl+aIdx);
+				aNameOffset = (*aOff) << 2;
+				aSymName = aStrTable + aNameOffset;
+			}
+			PrintString("0x%08x \t%s\t\n",aSymAddrTbl[aIdx], aSymName);
+		}
+	}
+	else
+	{
+		PrintString("No Symbol exported\n");
+	}
+	PrintString("\n\n");
+
+	if(aSymInfoHdr->iDllCount)
+	{
+		// The import table orders the dependencies alphabetically...
+		// We need to list out in the link order...
+		PrintString("%d Static dependencies found\n", aSymInfoHdr->iDllCount);
+		TUint* aDepTbl = (TUint*)((char*)aSymInfoHdr + aSymInfoHdr->iDepDllZeroOrdTableOffset);
+		TUint* aDepOffset =  (TUint*)((char*)aDepTbl - iData);
+
+		const E32ImportSection* isection = (const E32ImportSection*)(iData + iOrigHdr->iImportOffset);
+		
+		TInt d;
+
+		/* The import table has offsets to the location (in code section) where the
+		 * import is required. For dependencies pointed by 0th ordinal, this offset
+		 * must be same as the offset of the dependency table entry (relative to 
+		 * the code section).
+		 */
+		bool aZerothFound;
+		for(int aDep = 0; aDep < aSymInfoHdr->iDllCount; aDep++)
+		{
+			const E32ImportBlock* b = (const E32ImportBlock*)(isection + 1);
+			aZerothFound = false;
+			for (d=0; d<iOrigHdr->iDllRefTableCount; d++)
+			{
+				char* dllname = iData + iOrigHdr->iImportOffset + b->iOffsetOfDllName;
+				TInt n = b->iNumberOfImports;
+
+				const TUint* p = b->Imports()+ (n - 1);//start from the end of the import table
+				TUint impfmt = iOrigHdr->ImportFormat();
+				if (impfmt == KImageImpFmt_ELF)
+				{
+					while (n--)
+					{
+						TUint impd_offset = *p--;
+						TUint impd = *(TUint*)(iData + iOrigHdr->iCodeOffset + impd_offset);
+						TUint ordinal = impd & 0xffff;
+					
+						if (ordinal == 0 )
+						{
+							if( impd_offset == ((TUint)aDepOffset - iOrigHdr->iCodeOffset))
+							{
+								/* The offset in import table is same as the offset of this 
+								 * dependency entry
+								 */
+								PrintString("\t%s\n", dllname);
+								aZerothFound = true;
+							}
+							break;
+						}
+					}
+				}
+				if(aZerothFound)
+					break;
+
+				b = b->NextBlock(impfmt);
+			}
+			if(!aZerothFound)
+			{
+				PrintString("!!Invalid dependency listed at %d\n",aDep );
+			}
+
+			aDepOffset++;
+		}
+	}
+}