void SymElf::init()
{
if (elf->e_machine() == EM_PPC64) {
unsigned short stridx = elf->e_shstrndx();
Elf_X_Shdr strshdr = elf->get_shdr(stridx);
Elf_X_Data strdata = strshdr.get_data();
const char *names = (const char *) strdata.d_buf();
for (unsigned i=0; i < elf->e_shnum(); i++) {
Elf_X_Shdr &shdr = elf->get_shdr(i);
if (strcmp(names + shdr.sh_name(), ".opd") != 0)
continue;
odp_section = & shdr;
need_odp = true;
break;
}
}
}
Symbol_t SymElf::getSymbolByName(std::string symname)
{
Symbol_t ret;
for (unsigned i=0; i < elf->e_shnum(); i++)
{
Elf_X_Shdr shdr = elf->get_shdr(i);
if (shdr.sh_type() != SHT_SYMTAB && shdr.sh_type() != SHT_DYNSYM) {
continue;
}
FOR_EACH_SYMBOL(shdr, symbol, str_buffer, idx)
{
unsigned str_loc = symbol.st_name(idx);
if (strcmp(str_buffer+str_loc, symname.c_str()) != 0)
continue;
if (symbol.st_shndx(idx) == 0) {
continue;
}
MAKE_SYMBOL(str_buffer+str_loc, idx, shdr, ret);
return ret;
}
}
// findFunctionIn_ld_so_1: this routine finds the symbol table for ld.so.1 and
// parses it to find the address of symbol r_debug
// it returns false on error
bool dynamic_linking::findFunctionIn_ld_so_1(pdstring f_name, int ld_fd,
Address ld_base_addr,
Address *f_addr, int st_type)
{
bool result = false;
Elf_X elf;
Elf_X_Shdr shstrscn;
Elf_X_Data shstrdata;
Elf_X_Shdr symscn;
Elf_X_Shdr strscn;
Elf_X_Data symdata;
Elf_X_Data strdata;
const char *shnames = NULL;
lseek(ld_fd, 0, SEEK_SET);
elf = Elf_X(ld_fd, ELF_C_READ);
if (elf.isValid()) shstrscn = elf.get_shdr( elf.e_shstrndx() );
if (shstrscn.isValid()) shstrdata = shstrscn.get_data();
if (shstrdata.isValid()) shnames = shstrdata.get_string();
if (elf.isValid() && shstrscn.isValid() && shstrdata.isValid()) {
for (int i = 0; i < elf.e_shnum(); ++i) {
Elf_X_Shdr shdr = elf.get_shdr(i);
if (!shdr.isValid()) return false;
const char* name = (const char *) &shnames[shdr.sh_name()];
if (P_strcmp(name, ".symtab") == 0) {
symscn = shdr;
} else if (P_strcmp(name, ".strtab") == 0) {
strscn = shdr;
}
}
if (strscn.isValid()) symdata = symscn.get_data();
if (symscn.isValid()) strdata = strscn.get_data();
if (symdata.isValid() && strdata.isValid()) {
Elf_X_Sym syms = symdata.get_sym();
const char* strs = strdata.get_string();
if (f_addr != NULL) *f_addr = 0;
for (u_int i = 0; i < syms.count(); ++i) {
if (syms.st_shndx(i) != SHN_UNDEF) {
if (syms.ST_TYPE(i) == st_type) {
pdstring name = pdstring(&strs[ syms.st_name(i) ]);
if (name == f_name) {
if (f_addr != NULL) {
*f_addr = syms.st_value(i) + ld_base_addr;
}
result = true;
break;
}
}
}
}
}
}
elf.end();
return result;
}
