toolsandutils/e32tools/elftools/elftran/elf_reloc.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 19 Feb 2010 23:57:18 +0200
branchRCL_3
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child 2 99082257a271
permissions -rw-r--r--
Revision: 201007 Kit: 201007
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// Copyright (c) 1996-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of the License "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#include <stdlib.h>
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#include <string.h>
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#include <e32std.h>
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#include <e32std_private.h>
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#include "elftran.h"
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#include "elffile.h"
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#include "h_utl.h"
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#include <assert.h>
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TInt sizeOfRelocs(Elf32_Rel **relocs, TInt nrelocs)
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	{
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	TInt bytecount=0;
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	TInt page=-1;
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	TInt i;
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	for (i=0; i<nrelocs; i++)
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		{
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		TInt p=relocs[i]->r_offset&0xfffff000;
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		if (page!=p)
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			{
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			if (bytecount%4!=0)
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				bytecount+=2;
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			bytecount+=8; // page, block size
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			page=p;
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			}
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		bytecount+=2;
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		}
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	if (bytecount%4!=0)
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		bytecount+=2;
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	return bytecount;
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	}
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char* E32ImageFile_ELF::CreateRelocs(ELFFile& aElfFile, Elf32_Rel **relocs, TInt nrelocs, TInt &aSize, TUint aBase)
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	{
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	TInt bytecount=sizeOfRelocs(relocs, nrelocs);
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	aSize=0;
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	if (bytecount==0)
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		return NULL;
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	aSize=bytecount+sizeof(E32RelocSection);
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	char *section=new char [bytecount+sizeof(E32RelocSection)];
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	char *data=section+sizeof(E32RelocSection);
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	char *startofblock=data;
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	TInt page=-1;
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	TInt pagesize=8;
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	TInt i;
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	for (i=0; i<nrelocs; i++)
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		{
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		TInt p=relocs[i]->r_offset&0xfffff000;
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		if (page!=p)
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			{
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			if (pagesize%4!=0)
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				{
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				*(TUint16 *)data=0;
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				data+=2;
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				pagesize+=2;
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				}
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			if (page == -1) page = p;
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			*(TUint *)startofblock=page - aBase;
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			*(TUint *)(startofblock+4)=pagesize;
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			pagesize=8;
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			page=p;
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			startofblock=data;
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			data+=8;
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			}
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		TUint16 relocType = aElfFile.GetRelocType(relocs[i]);
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		*(TUint16 *)data=(TUint16)((relocs[i]->r_offset&0xfff)|relocType);
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		data+=2;
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		pagesize+=2;
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		}
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	if (pagesize%4!=0)
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		{
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		*(TUint16 *)data=0;
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		data+=2;
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		pagesize+=2;
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		}
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	*(TUint *)startofblock=page - aBase;
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	*(TUint *)(startofblock+4)=pagesize;
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	((E32RelocSection *)section)->iNumberOfRelocs=nrelocs;
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	((E32RelocSection *)section)->iSize=bytecount;
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	return section;
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	}
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void checkreloc(ELFFile& aElfFile, TUint va, TUint reloc)
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	{
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	// This will warn if appears to be outside any known segment.
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   	// NB. Such relocations can occur as the result of 'optimizations'
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   	// and aren't 'bugs'.
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   	// It turns out that the released version of RVCT makes such widespread
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   	// use of the optimization that this warning is disconcerting and
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   	// unhelpful.
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 	(void) aElfFile;
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 	(void)va;
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 	(void)reloc;
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#if 0
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	if (!aElfFile.GetSegmentFromAddr(va)) 
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		Print(EWarning, "dubious relocation:  [%08x] = %08x\n", reloc, va);
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#endif
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	}
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void E32ImageFile_ELF::FixRelocs(ELFFile &aElfFile, Elf32_Rel **codeRelocs, Elf32_Rel **dataRelocs)
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	{
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	TUint *data;
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	TInt numberOfCodeRelocs = aElfFile.NumberOfCodeRelocs();
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	TInt numberOfDataRelocs = aElfFile.NumberOfDataRelocs();
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	for (TInt i=0; i<numberOfCodeRelocs; i++)
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	        {
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		data=aElfFile.CodePtrFromAddr(codeRelocs[i]->r_offset);
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		checkreloc(aElfFile, *data, codeRelocs[i]->r_offset);
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		//*data=FixAddress(aElfFile, *data, codeRelocs[i]);
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		}
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// fix defect
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	for (TInt j=0; j<numberOfDataRelocs; j++)
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	        {
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		data=aElfFile.DataPtrFromAddr(dataRelocs[j]->r_offset);
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		checkreloc(aElfFile, *data, dataRelocs[j]->r_offset);
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		//*data=FixAddress(aElfFile, *data, dataRelocs[j]);
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		}
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	}
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TUint E32ImageFile_ELF::FixAddress(ELFFile &aElfFile, TUint va, Elf32_Rel * rel)
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//
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// Fix the given virtual address for the new headers
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//
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	{
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	Elf32_Phdr * segment = aElfFile.GetSegmentFromAddr(rel->r_offset);
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	assert(aElfFile.CodeSegmentP(segment) || aElfFile.DataSegmentP(segment));
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	TUint offset = va - segment->p_vaddr;
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	if (aElfFile.CodeSegmentP(segment))
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	      return (TUint)aElfFile.GetCode() + offset;
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	else 
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	      return (TUint)aElfFile.GetData() + offset;
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	}
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