What are the meanings of the columns of the symbol table displayed by readelf?

Question

Could someone explain the columns shown of the symbol table using readelf?

Answer 1

Ok this question is old, but good old Google yields it if you are looking for readelf symboltable and NDX;

Here is what I found out:

The C code compiled with avr-gcc:

int XYZ = 123;
int ABC;

when the generated elf file is analyzed using

readelf --symbols KoreOS.elf

you get as output:

Num:    Value  Size Type    Bind   Vis      Ndx Name
...
148: 0080200b     2 OBJECT  GLOBAL DEFAULT    2 XYZ
...
258: 00803878     2 OBJECT  GLOBAL DEFAULT    3 ABC
...

I use the NDX column as hint if the variable is initialized or not. But I found no documentation anywhere so I'm just guessing.

greetings, Dominik