How does GDB get the function call stack

hilbert via Gdb <[email protected]>
Newsgroups gmane.comp.gdb.devel
Message-ID <[email protected]>
Hi ,  
There are 4 ways to get the function call stack in the GDB Internals Manual.   https://sourceware.org/gdb/papers/unwind.html
For x86_64, does GDB get information by parsing the .eh_frame section? Or just get the call stack by Parse the function prologues.
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