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/* libxelf - symbol information abstraction module
*
* by scut / teso
*/
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <common.h>
#include <elf_symbol.h>
#include <elf_util.h>
unsigned int
elf_sym_addr (elf_symbol *sym)
{
return (sym->sent.st_value);
}
elf_symbol *
elf_sym_fetch_byindex (elf_base *base, unsigned int symidx)
{
unsigned int sym_size;
Elf32_Sym sym;
elf_section * strtab;
elf_symbol * new;
assert (base->symtab != NULL);
sym_size = base->symtab->data_len / sizeof (Elf32_Sym);
if (symidx >= sym_size) {
elf_error (base->elf, "symidx (%u) out of bounds (0-%u)",
symidx, sym_size - 1);
return (NULL);
}
memcpy (&sym, &base->symtab->data[symidx * sizeof (Elf32_Sym)],
sizeof (Elf32_Sym));
strtab = elf_section_list_find_index (base->seclist,
base->symtab->Shdr.sh_link);
if (strtab == NULL) {
elf_error (base->elf, "no string table for symbol table "
"(sh_idx = %lu)", base->symtab->sh_idx);
}
/* allocate and fill structure
*/
new = xcalloc (1, sizeof (elf_symbol));
new->name = elf_string (strtab, sym.st_name);
memcpy (&new->sent, &sym, sizeof (Elf32_Sym));
new->sec = elf_section_list_find_index (base->seclist, sym.st_shndx);
return (new);
}
char *
elf_string (elf_section *strtab, unsigned int offset)
{
if (strtab == NULL)
return ("__unknown_str");
if (offset >= strtab->data_len) {
elf_error (NULL, "FATAL: offset (0x%08x) out of bounds for "
"string table \"%s\" (0-0x%08x)",
offset, (strtab->name == NULL) ? "__unknown" :
strtab->name, strtab->data_len);
exit (EXIT_FAILURE);
}
return (&strtab->data[offset]);
}
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