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/*
Title: Export memory as an ELF object file
Author: David C. J. Matthews.
Copyright (c) 2006 David C. J. Matthews
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR H PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef ELFExport_H_INCLUDED
#define ELFExport_H_INCLUDED
#include "config.h"
#include "scanaddrs.h" // For base class
#include "exporter.h"
#ifdef HAVE_ELF_H
#include <elf.h>
#endif
#ifdef HAVE_ELF_ABI_H
#include <elf_abi.h>
#endif
// Select 32 or 64 bit version depending on the word length
#if (SIZEOF_VOIDP == 8)
#define ElfXX_Addr Elf64_Addr
#define ElfXX_Rel Elf64_Rel
#define ElfXX_Rela Elf64_Rela
#define ElfXX_Sym Elf64_Sym
#define ElfXX_Ehdr Elf64_Ehdr
#define ElfXX_Shdr Elf64_Shdr
// Include a cast on the next line. Linux includes this anyway but it's needed for FreeBSD.
#define ELFXX_R_INFO(_y, _z) ELF64_R_INFO((Elf64_Xword)(_y), _z)
#define ELFXX_ST_INFO(_y, _z) ELF64_ST_INFO(_y, _z)
#define ELFCLASSXX ELFCLASS64
#else
#define ElfXX_Addr Elf32_Addr
#define ElfXX_Rel Elf32_Rel
#define ElfXX_Rela Elf32_Rela
#define ElfXX_Sym Elf32_Sym
#define ElfXX_Ehdr Elf32_Ehdr
#define ElfXX_Shdr Elf32_Shdr
#define ELFXX_R_INFO(_y, _z) ELF32_R_INFO(_y, _z)
#define ELFXX_ST_INFO(_y, _z) ELF32_ST_INFO(_y, _z)
#define ELFCLASSXX ELFCLASS32
#endif
#ifdef HOSTARCHITECTURE_MIPS64
/* MIPS N64 ABI has a different Elf64_Rel/Rela layout */
typedef struct
{
Elf64_Addr r_offset; /* Address */
Elf64_Word r_sym; /* Symbol index */
unsigned char r_ssym; /* Special symbol */
unsigned char r_type3; /* Third relocation type */
unsigned char r_type2; /* Second relocation type */
unsigned char r_type; /* First relocation type */
} Elf64_Mips_Rel;
typedef struct
{
Elf64_Addr r_offset; /* Address */
Elf64_Word r_sym; /* Symbol index */
unsigned char r_ssym; /* Special symbol */
unsigned char r_type3; /* Third relocation type */
unsigned char r_type2; /* Second relocation type */
unsigned char r_type; /* First relocation type */
Elf64_Sxword r_addend; /* Addend */
} Elf64_Mips_Rela;
#undef ElfXX_Rel
#define ElfXX_Rel Elf64_Mips_Rel
#undef ElfXX_Rela
#define ElfXX_Rela Elf64_Mips_Rela
/* Elf64_Mips_Rel/Rela has no r_info, so this macro is meaningless */
#undef ELFXX_R_INFO
#endif
class TaskData;
class ELFExport: public Exporter, public ScanAddress
{
public:
ELFExport(): relocationCount(0), symbolCount(0), directReloc(0) {}
public:
virtual void exportStore(void);
private:
// ScanAddress overrides
virtual void ScanConstant(byte *addrOfConst, ScanRelocationKind code);
// At the moment we should only get calls to ScanConstant.
virtual PolyObject *ScanObjectAddress(PolyObject *base) { return base; }
private:
void setRelocationAddress(void *p, ElfXX_Addr *reloc);
PolyWord createRelocation(PolyWord p, void *relocAddr);
void writeSymbol(const char *symbolName, long value, long size, int binding, int sttype, int section);
unsigned long makeStringTableEntry(const char *str, ExportStringTable *stab);
void alignFile(int align);
void createStructsRelocation(unsigned area, POLYUNSIGNED offset, POLYSIGNED addend);
unsigned relocationCount;
unsigned symbolCount;
// There are two tables - one is used for section names, the other for symbol names.
ExportStringTable symStrings, sectionStrings;
unsigned directReloc;
bool useRela; // True if we should ElfXX_Rela rather than ElfXX_Rel TaskData *taskData; // Needed for exceptions.
};
#endif
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