ELF 解析符号包，包含symtab 和dynsym
ELF 解析符号包，包含symtab 和dynsym，并未对所以平台支持
/*
* ParseDynSymTable.c
*
* Created on: 2014年7月19日
* Author: angel-toms
*/
#include "ElfParser.h"
Elf32_Sym* get_elf_section_of_sym_table(MemMapping* mem,Elf32_Ehdr* pHeader,Elf32_Shdr* pSheader){
Elf32_Sym* pSymMem = NULL;
u1* shStringTableMem = NULL;
u4 i = 0;
shStringTableMem = get_elf_section_of_shstr_table(mem,pHeader,pSheader);
if(NULL == shStringTableMem){
printf("Error,get elf section header string table failed !\n");
goto Exit;
}
for( ; i < pHeader->e_shnum ; i++){
if(pSheader[i].sh_type == SHT_SYMTAB && strcmp((const char*)(shStringTableMem + pSheader[i].sh_name),".symtab") == 0){
pSymMem = calloc(1,pSheader[i].sh_size);
if(NULL == pSymMem){
perror("Error,calloc elf sym table failed");
goto Exit;
}
memcpy(pSymMem,(mem->base + pSheader[i].sh_offset),pSheader[i].sh_size);
break;
}
continue;
}
Exit:
if(shStringTableMem)
free(shStringTableMem);
return pSymMem;
}
Elf32_Sym* get_elf_section_of_dynsym_table(MemMapping* mem,Elf32_Ehdr* pHeader,Elf32_Shdr* pSheader){
Elf32_Sym* pDynmMem = NULL;
u1* shStringTableMem = NULL;
u4 i = 0;
shStringTableMem = get_elf_section_of_shstr_table(mem,pHeader,pSheader);
if(NULL == shStringTableMem){
printf("Error,get elf section header string table failed !\n");
goto Exit;
}
for( ; i < pHeader->e_shnum ; i++){
if(pSheader[i].sh_type == SHT_SYMTAB && strcmp((const char*)(shStringTableMem + pSheader[i].sh_name),".symtab") == 0){
pDynmMem = calloc(1,pSheader[i].sh_size);
if(NULL == pDynmMem){
perror("Error,calloc elf dyn sym section failed");
goto Exit;
}
memcpy(pDynmMem,(mem->base + pSheader[i].sh_offset),pSheader[i].sh_size);
break;
}
continue;
}
Exit:
if(shStringTableMem)
free(shStringTableMem);
return pDynmMem;
}
void print_elf_section_of_sym_table(MemMapping* mem,Elf32_Ehdr* pHeader,Elf32_Shdr* pSheader){
Elf32_Sym* pSymMem = NULL;
u1* shStringTableMem = NULL;
u4 i = 0;
u4 size = 0;
LookupSection* pLookupSection = NULL;
Elf32_Shdr* pSymtab = NULL;
shStringTableMem = get_elf_section_of_shstr_table(mem,pHeader,pSheader);
if(NULL == shStringTableMem){
printf("Error,get elf section header string table failed !\n");
goto Exit;
}
for( ; i < pHeader->e_shnum ; i++){
if(pSheader[i].sh_type == SHT_SYMTAB && strcmp((const char*)(shStringTableMem + pSheader[i].sh_name),".symtab") == 0){
size = (pSheader[i].sh_size / pSheader[i].sh_entsize);
pSymMem = (Elf32_Sym*)(mem->base + pSheader[i].sh_offset);
pSymtab = (Elf32_Shdr*) &pSheader[i];
break;
}
continue;
}
if(NULL != pSymMem){
//@1 by default ,symtab link strtab ,so it sh_link is the index, u can impl get_elf_section_of_string_table
pLookupSection = get_section_by_index(mem,pHeader,pSheader,pSymtab->sh_link);
if(NULL == pLookupSection){
printf("Error,get section by index failed");
goto Exit;
}
printf("Symbol table :\n");
printf("Symbol table '.symtab' contains %d entries:\n",size);
printf("Num: Value Size Type Bind Vis Ndx Name\n");
i = 0;
for(; i < size ; i++){
printf("%3d: ",i);
printf("%.8x ",pSymMem[i].st_value);
printf("%-7d",pSymMem[i].st_size);
switch(ELF32_ST_TYPE(pSymMem[i].st_info)){
case STT_NOTYPE:
printf("%-30s","Unspecified type");
break;
case STT_OBJECT:
printf("%-30s","Data object");
break;
case STT_FUNC:
printf("%-30s","Function");
break;
case STT_SECTION:
printf("%-30s","Section");
break;
case STT_FILE:
printf("%-30s","Source file");
break;
case STT_COMMON:
printf("%-30s","Uninitialized common block");
break;
case STT_TLS:
printf("%-30s","TLS object");
break;
case STT_NUM:
printf("%-30s","NUM");
break;
case STT_LOOS:
printf("%-30s","TLS object");
break;
case STT_HIOS:
printf("%-30s","specific semantics");
break;
case STT_LOPROC:
printf("%-30s","reserved range for processor");
break;
case STT_HIPROC:
printf("%-30s","specific semantics");
break;
default:
printf("%-30s","");
break;
}
switch(ELF32_ST_BIND(pSymMem[i].st_info)){
case STB_LOCAL:
printf("%-37s","Local symbol");
break;
case STB_GLOBAL:
printf("%-37s","Global symbol");
break;
case STB_WEAK:
printf("%-37s","like global - lower precedence");
break;
case STB_LOOS:
printf("%-37s","Reserved range for operating system");
break;
case STB_HIOS:
printf("%-37s","specific semantics");
break;
case STB_LOPROC:
printf("%-37s","reserved range for processor");
break;
case STB_HIPROC:
printf("%-37s","specific semantics");
break;
default:
printf("%-37s","");
break;
}
switch(ELF32_ST_VISIBILITY(pSymMem[i].st_other)){
case STV_DEFAULT:
printf("%-10s","DEFAULT");
break;
case STV_INTERNAL:
printf("%-10s","INTERNA");
break;
case STV_HIDDEN:
printf("%-10s","HIDDEN");
break;
case STV_PROTECTED:
printf("%-10s","PROTECTED");
break;
case STV_EXPORTED:
printf("%-10s","EXPORTED");
break;
case STV_SINGLETON:
printf("%-10s","SINGLETON");
break;
case STV_ELIMINATE:
printf("%-10s","ELIMINATE");
break;
default:
printf("%-10s","");
break;
}
switch(pSymMem[i].st_shndx){
case SHN_UNDEF:
printf("%-10s","UNDEF");
break;
case SHN_LORESERVE:
printf("%-10s","LORESERVE");
break;
case SHN_HIPROC:
printf("%-10s","HIPROC");
break;
case SHN_LOOS:
printf("%-10s","LOOS");
break;
case SHN_HIOS:
printf("%-10s","HIOS");
break;
case SHN_ABS:
printf("%-10s","ABS");
break;
case SHN_COMMON:
printf("%-10s","COMMON");
break;
case SHN_XINDEX:
printf("%-10s","XINDEX");
break;
default:
printf("%-10d",pSymMem[i].st_shndx);
break;
}
printf("%s",(pLookupSection->base + pSymMem[i].st_name));
printf("\n");
}
}
Exit:
if(shStringTableMem)
free(shStringTableMem);
if(pLookupSection)
free(pLookupSection);
}
void print_elf_section_of_dyn_sym_table(MemMapping* mem,Elf32_Ehdr* pHeader,Elf32_Shdr* pSheader){
Elf32_Sym* pDynSymMem = NULL;
u1* shStringTableMem = NULL;
u4 i = 0;
u4 size = 0;
LookupSection* pLookupSection = NULL;
Elf32_Shdr* pynSymtab = NULL;
shStringTableMem = get_elf_section_of_shstr_table(mem,pHeader,pSheader);
if(NULL == shStringTableMem){
printf("Error,get elf section header string table failed !\n");
goto Exit;
}
for( ; i < pHeader->e_shnum ; i++){
if(pSheader[i].sh_type == SHT_DYNSYM && strcmp((const char*)(shStringTableMem + pSheader[i].sh_name),".dynsym") == 0){
size = (pSheader[i].sh_size / pSheader[i].sh_entsize);
pDynSymMem = (Elf32_Sym*)(mem->base + pSheader[i].sh_offset);
pynSymtab = (Elf32_Shdr*)&pSheader[i];
break;
}
continue;
}
if(NULL != pDynSymMem){
//@1 by default ,dynsym link strtab ,so it sh_link is the index, u can impl get_elf_section_of_string_table
pLookupSection = get_section_by_index(mem,pHeader,pSheader,pynSymtab->sh_link);
if(NULL == pLookupSection){
printf("Error,get section by index failed");
goto Exit;
}
printf("Symbol dyn table :\n");
printf("Symbol table '.dynsym' contains %d entries:\n",size);
printf("Num: Value Size Type Bind Vis Ndx Name\n");
i = 0;
for(; i < size ; i++){
printf("%3d: ",i);
printf("%.8x ",pDynSymMem[i].st_value);
printf("%-7d",pDynSymMem[i].st_size);
switch(ELF32_ST_TYPE(pDynSymMem[i].st_info)){
case STT_NOTYPE:
printf("%-30s","Unspecified type");
break;
case STT_OBJECT:
printf("%-30s","Data object");
break;
case STT_FUNC:
printf("%-30s","Function");
break;
case STT_SECTION:
printf("%-30s","Section");
break;
case STT_FILE:
printf("%-30s","Source file");
break;
case STT_COMMON:
printf("%-30s","Uninitialized common block");
break;
case STT_TLS:
printf("%-30s","TLS object");
break;
case STT_NUM:
printf("%-30s","NUM");
break;
case STT_LOOS:
printf("%-30s","TLS object");
break;
case STT_HIOS:
printf("%-30s","specific semantics");
break;
case STT_LOPROC:
printf("%-30s","reserved range for processor");
break;
case STT_HIPROC:
printf("%-30s","specific semantics");
break;
default:
printf("%-30s","");
break;
}
switch(ELF32_ST_BIND(pDynSymMem[i].st_info)){
case STB_LOCAL:
printf("%-37s","Local symbol");
break;
case STB_GLOBAL:
printf("%-37s","Global symbol");
break;
case STB_WEAK:
printf("%-37s","like global - lower precedence");
break;
case STB_LOOS:
printf("%-37s","Reserved range for operating system");
break;
case STB_HIOS:
printf("%-37s","specific semantics");
break;
case STB_LOPROC:
printf("%-37s","reserved range for processor");
break;
case STB_HIPROC:
printf("%-37s","specific semantics");
break;
default:
printf("%-37s","");
break;
}
switch(ELF32_ST_VISIBILITY(pDynSymMem[i].st_other)){
case STV_DEFAULT:
printf("%-10s","DEFAULT");
break;
case STV_INTERNAL:
printf("%-10s","INTERNA");
break;
case STV_HIDDEN:
printf("%-10s","HIDDEN");
break;
case STV_PROTECTED:
printf("%-10s","PROTECTED");
break;
case STV_EXPORTED:
printf("%-10s","EXPORTED");
break;
case STV_SINGLETON:
printf("%-10s","SINGLETON");
break;
case STV_ELIMINATE:
printf("%-10s","ELIMINATE");
break;
default:
printf("%-10s","");
break;
}
switch(pDynSymMem[i].st_shndx){
case SHN_UNDEF:
printf("%-10s","UNDEF");
break;
case SHN_LORESERVE:
printf("%-10s","LORESERVE");
break;
case SHN_HIPROC:
printf("%-10s","HIPROC");
break;
case SHN_LOOS:
printf("%-10s","LOOS");
break;
case SHN_HIOS:
printf("%-10s","HIOS");
break;
case SHN_ABS:
printf("%-10s","ABS");
break;
case SHN_COMMON:
printf("%-10s","COMMON");
break;
case SHN_XINDEX:
printf("%-10s","XINDEX");
break;
default:
printf("%-10d",pDynSymMem[i].st_shndx);
break;
}
printf("%s",(pLookupSection->base + pDynSymMem[i].st_name));
printf("\n");
}
}
Exit:
if(shStringTableMem)
free(shStringTableMem);
if(pLookupSection)
free(pLookupSection);
}