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Elf file reader.

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Reads the symbols of all sections and provides
addresses to functions and data objects.
 


git-svn-id: https://www4.informatik.uni-erlangen.de/i4svn/danceos/trunk/devel/fail@1592 8c4709b5-6ec9-48aa-a5cd-a96041d1645a
This commit is contained in:
hoffmann
2012-09-05 11:03:29 +00:00
parent 8eb7bd129a
commit 63a41c7d67
10 changed files with 3332 additions and 0 deletions
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4
src/core/util/CMakeLists.txt
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@ -1,4 +1,8 @@
set(SRCS
ElfReader.cc
ElfReader.hpp
elfinfo/elfinfo.cc
elfinfo/elfinfo.h
Logger.cc
Logger.hpp
MemoryMap.hpp

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src/core/util/ElfReader.cc Normal file
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#include "ElfReader.hpp"
#include "elfinfo/elfinfo.h"
#include <stdio.h>
namespace fail {
ElfReader::ElfReader(const char* path) : m_log("Fail*Elfinfo", false){
// Try to open the ELF file
FILE * fp = fopen(path, "r");
if (!fp) {
m_log << "Error: Could not open " << path << std::endl;
return;
}
// Evaluate headers
Elf32_Ehdr ehdr;
Elf32_Shdr sec_hdr;
int num_hdrs,i;
fseek(fp,(off_t)0,SEEK_SET);
read_ELF_file_header(fp, &ehdr);
num_hdrs=ehdr.e_shnum;
m_log << "Evaluating ELF File: " << path << std::endl;
// Parse symbol table and generate internal map
for(i=0;i<num_hdrs;i++)
{
if(read_ELF_section_header(i,&sec_hdr,fp)==-1)
{
m_log << "Wrong Section to read" << std::endl;
}
else
{
if((sec_hdr.sh_type==SHT_SYMTAB)||(sec_hdr.sh_type==SHT_DYNSYM))
{
process_symboltable(i,fp);
}
else
{
continue;
}
}
}
fclose(fp);
}
int ElfReader::process_symboltable(int sect_num, FILE* fp){
Elf32_Shdr sect_hdr;
Elf32_Sym mysym;
char *name_buf=NULL;
int num_sym,link,i,idx;
off_t sym_data_offset;
int sym_data_size;
if(read_ELF_section_header(sect_num,&sect_hdr,fp)==-1)
{
return -1;
}
//we have to check to which strtab it is linked
link=sect_hdr.sh_link;
sym_data_offset=sect_hdr.sh_offset;
sym_data_size=sect_hdr.sh_size;
num_sym=sym_data_size/sizeof(Elf32_Sym);
//read the coresponding strtab
if(read_ELF_section_header(link,&sect_hdr,fp)==-1)
{
return -1;
}
//get the size of strtab in file and allocate a buffer
name_buf=(char*)malloc(sect_hdr.sh_size);
if(!name_buf)
return -1;
//get the offset of strtab in file and seek to it
fseek(fp,sect_hdr.sh_offset,SEEK_SET);
//read all data from the section to the buffer.
fread(name_buf,sect_hdr.sh_size,1,fp);
//so we have the namebuf now seek to symtab data
fseek(fp,sym_data_offset,SEEK_SET);
m_log << "[section " << sect_num << "] contains " << num_sym << " symbols." << std::endl;
for(i=0;i<num_sym;i++)
{
fread(&mysym,sizeof(Elf32_Sym),1,fp);
idx=mysym.st_name;
int type = ELF32_ST_TYPE(mysym.st_info);
if((type != STT_SECTION) && (type != STT_FILE)){
m_log << " " << (i) << " " << name_buf+idx << " @ " << mysym.st_value << std::endl;
m_map[name_buf+idx] = mysym.st_value;
}
}
free (name_buf);
return 0;
}
guest_address_t ElfReader::getAddressByName(const std::string& name) {
if( m_map.find(name) == m_map.end() ) {
return -1;
}else{
return m_map[name];
}
}
std::string getNameByAddress(guest_address_t address) {
return "Test";
}
} // end-of-namespace fail

58
src/core/util/ElfReader.hpp Normal file
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#ifndef __ELFREADER_HPP__
#define __ELFREADER_HPP__
#include <string>
#include <map>
#include "sal/SALConfig.hpp"
#include "Logger.hpp"
namespace fail {
/**
* \class ElfReader
* Parses an ELF file and provides a list of symbol names
* and corresponding addresses
*/
class ElfReader {
public:
/**
* Constructor.
* @param path Path to the ELF file.
*/
ElfReader(const char* path);
/**
* Get guest address by symbol name
* @param name The symbol name as string
* @return The according addres if found, else -1
*/
guest_address_t getAddressByName(const std::string& name) ;
/**
* Get symbol name associated to an address
* This is interesting when checking instruction pointers.
* @param name The address of a symbol (or around a symbol -> instruction pointer)
* @return The according address if found, else -1
*
* \todo multimap sorted by addresses
* Name is at first key <= address
*/
std::string getNameByAddress(guest_address_t address) ;
private:
Logger m_log;
std::map<std::string, guest_address_t> m_map;
int process_symboltable(int sect_num, FILE* fp);
};
} // end-of-namespace fail
#endif //__ELFREADER_HPP__

2
src/core/util/elfinfo/AUTHORS Normal file
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Ashok Shankar Das <ashok.s.das@gmail.com>

340
src/core/util/elfinfo/COPYING Normal file
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12
src/core/util/elfinfo/ChangeLog Normal file
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elfinfo 1.2
-added code to display prog headers
elfinfo 1.1
-modified display informations for sections and symbols
elfinfo 1.0
-initial release
elfinfo 0.2
-test release
elfinfo 0.1
-test release

11
src/core/util/elfinfo/README Normal file
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-=|elfinfo|=-
This Tool is essentially a ELF file parser, similar to eu-readelf, but have
a subset of functionality. This doesn't need libelf.
How to
======
1) run make to compile
2) run make install to install(su user)
3) at command line type elfinfo , it shows you a usage message

343
src/core/util/elfinfo/elfinfo.cc Normal file
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/* DISCLAIMER :This is a FREE SOFTWARE You can Use it at your own RISK
that is if you are screwed by using this software, then
accept the fact that you screwed yourself.
## THIS HAS BEEN DEVELOPED AND TESTED UNDER FEDORA-9 HOPEFULLY IT WILL
## WORK ON OTHER SYSTEMS
======================================================================
elfinfo.c - Copyright (C)2008 Ashok Shankar Das ashok.s.das@gmail.com
This code is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This code is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <elf.h>
void read_ELF_file_header(FILE* fp,Elf32_Ehdr *filehdr)
{
//rewind(fp);
fread(filehdr,sizeof(Elf32_Ehdr),1,fp);
}
int is_ELF(Elf32_Ehdr *hdr)
{
if(strncmp(reinterpret_cast<const char*>(hdr->e_ident),"\177ELF",4)==0)
return 1;
else
return -1;
}
int read_ELF_section_header(int sect_num,Elf32_Shdr *sect_hdr,FILE *fp)
{
int numsect;
Elf32_Ehdr elfhdr;
off_t sect_hdr_off;
fseek(fp,(off_t)0,SEEK_SET);
read_ELF_file_header(fp,&elfhdr);
numsect=elfhdr.e_shnum;
if ((numsect<sect_num)||(sect_num<0))
return -1;
sect_hdr_off=elfhdr.e_shoff;
//rewind(fp);
sect_hdr_off+=elfhdr.e_shentsize*sect_num;
fseek(fp,(off_t)sect_hdr_off,SEEK_SET);
fread(sect_hdr,sizeof(Elf32_Shdr),1,fp);
return 1;
}
void process_sect_hdr(Elf32_Shdr *sect_hdr,char *sect_name_buff)
{
int idx;
idx=sect_hdr->sh_name;
printf(" %-20s ",sect_name_buff+idx);
if(sect_hdr->sh_entsize)
printf(" %c ",'*');
else
printf(" %c ",' ');
switch(sect_hdr->sh_type)
{
case 0: printf("NULL \t");
break;
case 1: printf("PROGBITS \t");
break;
case 2: printf("SYMTAB \t");
break;
case 3: printf("STRTAB \t");
break;
case 4: printf("RELOC ADN \t");
break;
case 5: printf("HASH \t");
break;
case 6: printf("SYMTAB \t");
break;
case 7: printf("NOTE \t");
break;
case 8: printf("NOBIT \t");
break;
case 9: printf("RELOC \t");
break;
case 10: printf("*reserved* \t");
break;
case 11: printf("DYNSYM \t");
break;
case 14: printf("INITARR \t");
break;
case 15: printf("FINIARR \t");
break;
case 16: printf("PREINIT \t");
break;
case 17: printf("SECTGRP \t");
break;
case 18: printf("EXT-SHNDX \t");
break;
case 19: printf("NUM-DEF-TYP \t");
break;
case 0x60000000: printf("OS SPECIFIC \t");
break;
case 0x6ffffff5: printf("GNU_ATTR \t");
break;
case 0x6ffffff6: printf("GNU_HASH \t");
break;
case 0x6ffffff7: printf("PRELNKLIBLST \t");
break;
case 0x6ffffff8: printf("CKSUM \t");
break;
case 0x6ffffffa: printf("SUN SPECIFIC \t");
break;
case 0x6ffffffb: printf("SUNCOMDAT \t");
break;
case 0x6ffffffc: printf("SUNSYMINFO \t");
break;
case 0x6ffffffd: printf("GNUVERDEF \t");
break;
case 0x6ffffffe: printf("GNUVERNEED \t");
break;
case 0x6fffffff: printf("GNUVERSYM \t");
break;
case 0x70000000: printf("LOPROC \t");
break;
case 0x7fffffff: printf("HIPROC \t");
break;
case 0x80000000: printf("APP beg \t");
break;
case 0x8fffffff: printf("APP end \t");
break;
}
printf("linked to %3d sect\n",sect_hdr->sh_link);
}
void display_sections(FILE *fp)
{
Elf32_Ehdr ehdr;
Elf32_Shdr sec_hdr;
int num_hdrs,i;
char *buff=NULL;
fseek(fp,(off_t)0,SEEK_SET);
read_ELF_file_header(fp, &ehdr);
if(is_ELF(&ehdr)==-1)
{
printf("Not an ELF file\n");
exit(0);
}
num_hdrs=ehdr.e_shnum;
if(read_ELF_section_header(ehdr.e_shstrndx,&sec_hdr,fp)==-1)
{
printf("Error: reading section string table sect_num= %d\n",ehdr.e_shstrndx);
exit(0);
}
//we read the shstrtab
// read content from the file
buff=(char*)malloc(sec_hdr.sh_size);
if (!buff)
{
printf("Malloc failed to allocate buffer for shstrtab\n");
exit(0);
}
//seek to the offset in the file,
fseek(fp,(off_t)sec_hdr.sh_offset,SEEK_SET);
fread(buff,sec_hdr.sh_size,1,fp);
printf("There are [%d] sections\n",num_hdrs);
for(i=0;i<num_hdrs;i++)
{
if(read_ELF_section_header(i,&sec_hdr,fp)==-1)
{
printf("Wrong Section to read\n");
}
else
{
printf("[section %3d] ",i);
process_sect_hdr(&sec_hdr,buff);
}
}
if(buff)
free(buff);
}
int process_symtab(int sect_num,FILE *fp)
{
Elf32_Shdr sect_hdr;
Elf32_Sym mysym;
char *name_buf=NULL;
int num_sym,link,i,idx;
off_t sym_data_offset;
int sym_data_size;
if(read_ELF_section_header(sect_num,&sect_hdr,fp)==-1)
{
return -1;
}
//we have to check to which strtab it is linked
link=sect_hdr.sh_link;
sym_data_offset=sect_hdr.sh_offset;
sym_data_size=sect_hdr.sh_size;
num_sym=sym_data_size/sizeof(Elf32_Sym);
//read the coresponding strtab
if(read_ELF_section_header(link,&sect_hdr,fp)==-1)
{
return -1;
}
//get the size of strtab in file and allocate a buffer
name_buf=(char*)malloc(sect_hdr.sh_size);
if(!name_buf)
return -1;
//get the offset of strtab in file and seek to it
fseek(fp,sect_hdr.sh_offset,SEEK_SET);
//read all data from the section to the buffer.
fread(name_buf,sect_hdr.sh_size,1,fp);
//so we have the namebuf now seek to symtab data
fseek(fp,sym_data_offset,SEEK_SET);
printf("[%d] symbols\n",num_sym);
for(i=0;i<num_sym;i++)
{
//memcpy((char *)&mysym,(char *)sym_buf,sizeof(Elf32_Sym));
fread(&mysym,sizeof(Elf32_Sym),1,fp);
//dump_sym(&mysym);
idx=mysym.st_name;
//printf("symbol %d index in strtab %d\n",i,idx);
printf("[%3d] %s ",i,name_buf+idx);
switch(ELF32_ST_BIND(mysym.st_info))
{
case 0: printf(" LOCAL ");
break;
case 1: printf(" GLOBAL ");
break;
case 2: printf(" WEAK ");
break;
case 3: printf(" NUM ");
break;
case 10: printf(" OS-specific-start ");
break;
case 12: printf(" OS-specific-end ");
break;
case 13: printf(" CPU-specific-start ");
break;
case 15: printf("CPU-specific-end ");
break;
}
switch(ELF32_ST_TYPE(mysym.st_info))
{
case 0: printf(" NOTYPE ");
break;
case 1: printf(" OBJECT ");
break;
case 2: printf(" FUNC ");
break;
case 3: printf(" SECTION ");
break;
case 4: printf(" FILE ");
break;
case 5: printf(" COMMON ");
break;
case 6: printf(" TLS ");
break;
case 7: printf(" NUM ");
break;
case 10: printf(" OS-specific-start ");
break;
break;
case 12: printf(" OS-specific-end ");
break;
case 13: printf(" CPU-specific-start ");
break;
break;
case 15: printf(" CPU-specific-end ");
break;
}
switch(mysym.st_shndx)
{
case SHN_UNDEF: printf(" UNDEF ");
break;
case SHN_LOPROC: printf(" CPU-specific-start ");
break;
case SHN_HIPROC: printf(" CPU-specific-end ");
break;
case SHN_LOOS: printf(" OS-specific-start ");
break;
case SHN_HIOS: printf(" OS-specific-end ");
break;
case SHN_ABS: printf(" ABSOLUTE ");
break;
case SHN_COMMON: printf(" COMMON ");
break;
case SHN_XINDEX: printf(" XINDEX ");
break;
}
printf("\n");
}
if(name_buf)
free(name_buf);
return 0;
}
void dump_symbols(FILE *fp)
{
Elf32_Ehdr ehdr;
Elf32_Shdr sec_hdr;
int num_hdrs,i;
fseek(fp,(off_t)0,SEEK_SET);
read_ELF_file_header(fp, &ehdr);
num_hdrs=ehdr.e_shnum;
for(i=0;i<num_hdrs;i++)
{
if(read_ELF_section_header(i,&sec_hdr,fp)==-1)
{
printf("Wrong Section to read\n");
}
else
{
if((sec_hdr.sh_type==SHT_SYMTAB)||(sec_hdr.sh_type==SHT_DYNSYM))
{
printf("\n[section %3d] contains ",i);
process_symtab(i,fp);
}
else
continue;
}
}
}

21
src/core/util/elfinfo/elfinfo.h Normal file
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@ -0,0 +1,21 @@
/**
* ELF Helper
* \author Martin Hoffmann <hoffmann@cs.fau.de>
*/
#ifndef ELFINFO_H
#define ELFINFO_H
#if !defined(__APPLE__)
#include <elf.h>
#else
#include "mac-elf.h" /* Mac OS X doesn't distribute elf.h... */
#endif
#include <stdio.h>
// ELFinfo
void read_ELF_file_header(FILE* fp,Elf32_Ehdr *filehdr);
int read_ELF_section_header(int sect_num,Elf32_Shdr *sect_hdr,FILE *fp);
#endif // ELFINFO_H

2427
src/core/util/elfinfo/mac-elf.h Normal file
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