What does each column of objdump's Symbol table mean?

Question

SYMBOL TABLE:
0000000000000000  w      *UND*  0000000000000000              __gmon_start__

I\'ve man objdump but there\'s no such info.

Answer 1

http://www.cs.swarthmore.edu/~newhall/unixhelp/compilecycle.html#runtime

$ nm --format sysv simple   # system V format is easier to read than bsd format which is the default

Name                  Value   Class        Type         Size     Line  Section

...
foo                 |080484e6|   T  |              FUNC|0000000c|     |.text