Print symbol of file .o

Question

I want to print symbol of .o file (same of nm command). I iterate on each section. And use this condition:

if (section[i].sh_type == SHT_SYMTAB)
      {
                        sym = (Elf64_Sym *)((char *)content + 
                        section[i].sh_offset);
      }

When I have my Elf64_Sym struct, i want print the symbol name. The struct is:

typedef struct {
    uint32_t      st_name;
    unsigned char st_info;
    unsigned char st_other;
    uint16_t      st_shndx;
    Elf64_Addr    st_value;
    uint64_t      st_size;
} Elf64_Sym;

How to print the st_name ? His type is uint32_t. I don't understand how to print it.

An idea ? Thanks you !

I don't remember if it's an offset or an index into a string table. It's one of those anyway. — Some programmer dude, Feb 14 '18 at 12:24

score 0 · Answer 1 · answered Feb 20 '18 at 12:33

0

the st_name is an offset in the .shstrtab.

The string you're searching for is (char *)(addr of shstrtab) + sym->st_name;

answered Feb 20 '18 at 12:33

Nathan Schwarz

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Print symbol of file .o

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