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how does GDB find the symbols?

Hi,

I'm converting a coredump into the ELF format. At first, the outputs in GDB
came out blank, i.e.
#0 0x40091aa5 in ?? ()


But after I added some other infomation, now I get the symbols filled in.
i.e.

#0 0x40091aa5 in sigset (sig=-1073747472, disp=0x20) at
    ../sysdeps/posix/sigset.c:69

Where does GDB find the function names, the arg lists, and other such
information?

Thanks,
Lucy
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